Castrol GTX 10W 40 Oil - £3 Instore @ Tesco
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Castrol GTX 10W 40 Oil - £3 Instore @ Tesco

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Posted 2nd AugLocal
Was £12 now £3 for 2Litres. Spotted Tesco redcar.
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orate for an old transit...
stealth66602/08/2019 20:15

orate for an old transit...



orate??? WTF are you talking about?
Actually today's GTX 10W40 A3/B4 is a pretty good oil. The only thing 'wrong' with it is that it's not particularly 'green' as it won't give you the kind of fuel economy benefit that say a 0W20 would..
stealth66602/08/2019 20:41

orate as in orate? duz tha not spake Yorkshire?



Is this HUKD or HY? Anyway, whatever.
tintowellfan02/08/2019 20:50

Is this HUKD or HY? Anyway, whatever.


Tha must be in a dark place if tha can't spake english dialect.... god help thee with our guests
stealth66602/08/2019 21:23

Tha must be in a dark place if tha can't spake english dialect.... god …Tha must be in a dark place if tha can't spake english dialect.... god help thee with our guests



Chan eil mi a ’bruidhinn ach an gallic
tintowellfan02/08/2019 21:32

Chan eil mi a ’bruidhinn ach an gallic


I said english taff.. even the scotts and irish spake that
stealth66602/08/2019 21:47

I said english taff.. even the scotts and irish spake that


Aaah understood thee orate.
tintowellfan02/08/2019 20:50

Is this HUKD or HY? Anyway, whatever.


Unfortunately its no longer like victorian England.. stop pretending the uk has 'standards'
Joe90_guy02/08/2019 20:38

Actually today's GTX 10W40 A3/B4 is a pretty good oil. The only thing …Actually today's GTX 10W40 A3/B4 is a pretty good oil. The only thing 'wrong' with it is that it's not particularly 'green' as it won't give you the kind of fuel economy benefit that say a 0W20 would..


But if your car is specced for 10W/ 40 using a much thinner oil is not a very good idea. I'd certainly not use it in either of my turbocharged nineties motors, maybe an Auris hybrid though
stealth66602/08/2019 22:03

Unfortunately its no longer like victorian England.. stop pretending the …Unfortunately its no longer like victorian England.. stop pretending the uk has 'standards'


There's certainly no standards with Bojo and his chums
Rhythmeister02/08/2019 23:16

But if your car is specced for 10W/ 40 using a much thinner oil is not a …But if your car is specced for 10W/ 40 using a much thinner oil is not a very good idea. I'd certainly not use it in either of my turbocharged nineties motors, maybe an Auris hybrid though


Just because an OEM specs a thin viscosity grade oil for a particular engine, doesn't mean that engine won't run quite happily with a thicker grade of oil. All oils are thick when they're cold & relatively thin when they get hot. Statistically, the UK only needs a 15W-xx oil to cope with the worst temperatures our mild winters can offer! Today's PCMOs are only thin because they reflect OEMs needs for fuel economy.

I agree some of the old turbos were very hard on oil (ironically usually after the engine had been turned off!). For those engines, only PAO/ester based oils, like 90s vintage Mobil 1 would cut the mustard (not so sure about the modern stuff?). That said, you might be surprised at just how much better today's GTX would fare in an old turbo.
Joe90_guy03/08/2019 07:04

Just because an OEM specs a thin viscosity grade oil for a particular …Just because an OEM specs a thin viscosity grade oil for a particular engine, doesn't mean that engine won't run quite happily with a thicker grade of oil. All oils are thick when they're cold & relatively thin when they get hot. Statistically, the UK only needs a 15W-xx oil to cope with the worst temperatures our mild winters can offer! Today's PCMOs are only thin because they reflect OEMs needs for fuel economy.I agree some of the old turbos were very hard on oil (ironically usually after the engine had been turned off!). For those engines, only PAO/ester based oils, like 90s vintage Mobil 1 would cut the mustard (not so sure about the modern stuff?). That said, you might be surprised at just how much better today's GTX would fare in an old turbo.


Well, I run a 10W/ 60 in my mx5 but that's to reduce the effect of 11 psi trying to blow the hot oil from the cylinder walls, I would certainly produce more power with the 10W/ 40 its specced for I've used the same grade in my twin turbo Legacy as it's only a road car but very modern Miller's CFS, which I can highly recommend btw. A 5W/ 30 is like water at room temperature, I'd only recommend something like that with a modern engine with tight tolerances. Also, you said hard on
Edited by: "Rhythmeister" 3rd Aug
I chuck any old guff in my vehicle.....177,000 miles and still going strong.
Rhythmeister03/08/2019 09:28

Well, I run a 10W/ 60 in my mx5 but that's to reduce the effect of 11 psi …Well, I run a 10W/ 60 in my mx5 but that's to reduce the effect of 11 psi trying to blow the hot oil from the cylinder walls, I would certainly produce more power with the 10W/ 40 its specced for I've used the same grade in my twin turbo Legacy as it's only a road car but very modern Miller's CFS, which I can highly recommend btw. A 5W/ 30 is like water at room temperature, I'd only recommend something like that with a modern engine with tight tolerances. Also, you said hard on


Each to their own but I probably wouldn't describe Miller's CFS 10W-60 as 'good stuff'.

Download the Product Data Sheet and read 'Manufactured to far exceed SL/CF & A3/B4'.

So it can exceed API SL, a spec which, as I recall came out 18 years ago & has been superceded three times since. Also it claims it can far exceed API CF, a spec that has been administratively obsolete for God knows how many years now (also I'd very much dispute that ANY 10W60 could ever pass the Cat 1MPC test necessary to claim API CF because of its horrendous rubber loading). It's hardly indicative of something that's at the bleeding edge of technology!

(I said 'rubber', fnah fnah...)
Edited by: "Joe90_guy" 3rd Aug
Joe90_guy03/08/2019 12:49

Each to their own but I probably wouldn't describe Miller's CFS 10W-60 as …Each to their own but I probably wouldn't describe Miller's CFS 10W-60 as 'good stuff'.Download the Product Data Sheet and read 'Manufactured to far exceed SL/CF & A3/B4'. So it can exceed API SL, a spec which, as I recall came out 18 years ago & has been superceded three times since. Also it claims it can far exceed API CF, a spec that has been administratively obsolete for God knows how many years now (also I'd very much dispute that ANY 10W60 could ever pass the Cat 1MPC test necessary to claim API CF because of its horrendous rubber loading). It's hardly indicative of something that's at the bleeding edge of technology!(I said 'rubber', fnah fnah...)


CFS 10W/ 40 was greatly appreciated by the Legacy, thicker stiff would only give me even less mpg I'll have to check the specs out, what's rubber loading then?
There are three basic components in engine oil; base oil (typically 85-95%), the additive pack (typically 5 to 12%) & Viscosity Index Improver. VIIs are the clever long chain polymers that allow you to make multi-grades. The rubber loading of any oil is how much solid VII polymer (aka rubber) it contains. Generally the wider the viscosity grade, the more rubber it will contain (so 10W60>10W50>10W40>10W30). Although it gets complicated, the higher the rubber loading, the higher the oil's volatility, the more the oil will shear & the more piston deposits you'll get.
Edited by: "Joe90_guy" 3rd Aug
My Tescos had these at £1.50 each, I bought some and left 2 in the shelf. I did not post becuase they would be gone by they time I did. If National well worth stocking up.
Previous oil threads I posted oil does not go off if you don't open it, so buy when on offer. It is best to stick with the grade of oil that your manufacturer recommends.
Proveright03/08/2019 15:20

My Tescos had these at £1.50 each, I bought some and left 2 in the …My Tescos had these at £1.50 each, I bought some and left 2 in the shelf. I did not post becuase they would be gone by they time I did. If National well worth stocking up. Previous oil threads I posted oil does not go off if you don't open it, so buy when on offer. It is best to stick with the grade of oil that your manufacturer recommends.


Unfortunately not national, they were scanning at full price in Ards
Tesco Warwick has a shelf full circa 20-30 tubs with the yellow stickers at £2.97
38204988-HuDo5.jpg
Joe90_guy03/08/2019 12:49

Each to their own but I probably wouldn't describe Miller's CFS 10W-60 as …Each to their own but I probably wouldn't describe Miller's CFS 10W-60 as 'good stuff'.Download the Product Data Sheet and read 'Manufactured to far exceed SL/CF & A3/B4'. So it can exceed API SL, a spec which, as I recall came out 18 years ago & has been superceded three times since. Also it claims it can far exceed API CF, a spec that has been administratively obsolete for God knows how many years now (also I'd very much dispute that ANY 10W60 could ever pass the Cat 1MPC test necessary to claim API CF because of its horrendous rubber loading). It's hardly indicative of something that's at the bleeding edge of technology!(I said 'rubber', fnah fnah...)


In relation to the Miller's CFS, BOFI recommend it for turbocharged mx5s, I think Opie got it right for a road going boosted Subaru from the nineties but maybe I should've gone for Fuchs Titan Race Pro R bofiracing.co.uk/blo…x5/
Rhythmeister04/08/2019 09:21

In relation to the Miller's CFS, BOFI recommend it for turbocharged mx5s, …In relation to the Miller's CFS, BOFI recommend it for turbocharged mx5s, I think Opie got it right for a road going boosted Subaru from the nineties but maybe I should've gone for Fuchs Titan Race Pro R https://bofiracing.co.uk/blog/which-oil-weight-is-best-for-my-mx5/




Hmmm...so a racing company based in Barnsley recommends Miller's oil, blended oop t'North bah good Yoorrkkksh'r folk (an' let's 'ave Sir Geoffrey 'Brexit' Boycott fer PM while tha's at it!). I wonder why that is?

Jokes aside, purely from a old turbo perspective, where static oil can potentially 'sit' in what might be a glowing hot turbo, once the engine has been turned off, then I would say a PAO/Ester based oil is entirely the right way to go. You need the oil to be extremely resistant to thermal oxidation. Almost every blender pushes a variant of this class of oil & in truth, they're all much of a muchness & all based on the same Infineum DI/VII system.

Just bear in mind that the brand you buy has little meaning as there is almost zero expertise in some of these companies. They do not make their own base oils, additives, VII or PPDs. Nor do they run the hugely complex & eye-wateringly expensive technical programs that define modern engine oils. They just buy in, blend, can & market.
Edited by: "Joe90_guy" 4th Aug
Joe90_guy04/08/2019 10:25

Hmmm...so a racing company based in Barnsley recommends Miller's oil, …Hmmm...so a racing company based in Barnsley recommends Miller's oil, blended oop t'North bah good Yoorrkkksh'r folk (an' let's 'ave Sir Geoffrey 'Brexit' Boycott fer PM while tha's at it!). I wonder why that is?Jokes aside, purely from a old turbo perspective, where static oil can potentially 'sit' in what might be a glowing hot turbo, once the engine has been turned off, then I would say a PAO/Ester based oil is entirely the right way to go. You need the oil to be extremely resistant to thermal oxidation. Almost every blender pushes a variant of this class of oil & in truth, they're all much of a muchness & all based on the same Infineum DI/VII system.Just bear in mind that the brand you buy has little meaning as there is almost zero expertise in some of these companies. They do not make their own base oils, additives, VII or PPDs. Nor do they run the hugely complex & eye-wateringly expensive technical programs that define modern engine oils. They just buy in, blend, can & market.


If BOFI and Opie both recommend Miller's for my applications I don't know why I'd not use them is what I'm saying. I think the old hot oil sitting in a turbo thing isn't really an issue with fully synthetic oil is it? Who are these silly people who don't let their hot oil circulate for a few seconds after a jolly good boosting?
Rhythmeister04/08/2019 16:51

If BOFI and Opie both recommend Miller's for my applications I don't know …If BOFI and Opie both recommend Miller's for my applications I don't know why I'd not use them is what I'm saying. I think the old hot oil sitting in a turbo thing isn't really an issue with fully synthetic oil is it? Who are these silly people who don't let their hot oil circulate for a few seconds after a jolly good boosting?


It depends what you mean by 'full synthetic'. The 0W20 I have in the sump of my Suzuki is notionally a 'full synthetic' but it's based on hydrocracked mineral oil, not PAO/Ester. It's way better than old fashioned mineral oil & runs PAO/Ester a close second in many respects but it's definitely not as good in terms of very high temperature oxidation stability. It's also a quarter of the cost (to make, not retail). If you're careful & let the turbo cool before turning things off, it's fine but it you don't, expect some coking of the internals.

BTW, I'm personally more than happy with 0W20. I've been using it since 2006 & it really does deliver in terms of fuel economy. I'll happily shift over to 0W16 as & when it crosses the pond & becomes available in the UK.
Edited by: "Joe90_guy" 4th Aug
Oh, and one other thing...

In the next couple of months, do yourself a favour & buy some oil, say enough for your next couple of services & stash it in your garage. Every last thing that goes into oil is manufactured overseas. If supply is disrupted after October 31st (& it will be) getting hold of the slippery stuff could well prove problematic so don't get caught out.
Joe90_guy04/08/2019 18:30

Oh, and one other thing...In the next couple of months, do yourself a …Oh, and one other thing...In the next couple of months, do yourself a favour & buy some oil, say enough for your next couple of services & stash it in your garage. Every last thing that goes into oil is manufactured overseas. If supply is disrupted after October 31st (& it will be) getting hold of the slippery stuff could well prove problematic so don't get caught out.


… The doubters, the gloomsters, the doomsters are going to get it wrong. No one in the last few centuries has succeeded in betting against the pluck and nerve of this country. They will not succeed today”
ansonuk104/08/2019 20:03

… The doubters, the gloomsters, the doomsters are going to get it wrong. N …… The doubters, the gloomsters, the doomsters are going to get it wrong. No one in the last few centuries has succeeded in betting against the pluck and nerve of this country. They will not succeed today”


And not forgetting those oh so devout believers that just knew for sure The Third Reich would last 1,000 years!

Remind me again, in reality, was it 1,000 or 12????

It used to be our national sense of cynicism was our armour against oily con men selling unrealistic dreams. What happened to you?
Edited by: "Joe90_guy" 4th Aug
Joe90_guy04/08/2019 18:11

It depends what you mean by 'full synthetic'. The 0W20 I have in the sump …It depends what you mean by 'full synthetic'. The 0W20 I have in the sump of my Suzuki is notionally a 'full synthetic' but it's based on hydrocracked mineral oil, not PAO/Ester. It's way better than old fashioned mineral oil & runs PAO/Ester a close second in many respects but it's definitely not as good in terms of very high temperature oxidation stability. It's also a quarter of the cost (to make, not retail). If you're careful & let the turbo cool before turning things off, it's fine but it you don't, expect some coking of the internals.BTW, I'm personally more than happy with 0W20. I've been using it since 2006 & it really does deliver in terms of fuel economy. I'll happily shift over to 0W16 as & when it crosses the pond & becomes available in the UK.


I'd say that thin stuff is grand with a high compression NA engine but I just can't risk it myself with toasty turbos
Would you recommend a Fuchs or Mobil 1 fully synth over Castrol? It's a 10W/ 60 fully synthetic Mobil race oil I've put in my Mazda and it doesn't even seem to be getting burned off, it must be splendid at staying on the cylinder walls
Joe90_guy04/08/2019 18:30

Oh, and one other thing...In the next couple of months, do yourself a …Oh, and one other thing...In the next couple of months, do yourself a favour & buy some oil, say enough for your next couple of services & stash it in your garage. Every last thing that goes into oil is manufactured overseas. If supply is disrupted after October 31st (& it will be) getting hold of the slippery stuff could well prove problematic so don't get caught out.


I'm in norn iron so I'll buy some super duper oil from across the border in case we desert the EU on the 31st of Rocktober
Rhythmeister04/08/2019 20:33

I'd say that thin stuff is grand with a high compression NA engine but I …I'd say that thin stuff is grand with a high compression NA engine but I just can't risk it myself with toasty turbos Would you recommend a Fuchs or Mobil 1 fully synth over Castrol? It's a 10W/ 60 fully synthetic Mobil race oil I've put in my Mazda and it doesn't even seem to be getting burned off, it must be splendid at staying on the cylinder walls


Apologies for the delay. Today just got busy real quickly. Regarding Fuchs, Mobil or Castrol...

On no other basis that they (with the exception of a couple of notable arseholes) were the most fun company to run oil development programs for, I'd say Castrol. They were better before BP bought them but they have retained a degree of technical expertise & were always highly receptive to new ideas. If you go for one of their top-tier oils, it will deliver.

Fuchs I did a bit for in The Middle East but I always felt they were too small to be the real deal in terms of true understanding & expertise.

Mobil as such haven't existed for over 20 years as they 'merged' with Exxon (Esso to you & me). This is a good thing because the one meeting I had with Mobil proper, was like sitting down with The Sopranos! Horrible, nasty, thuggish people who were best avoided! Exxon rely on their in-house lube add company to do most of their engine oil development. Having had the misfortune to meet a few of these individuals & discovered some of the things they do, I might think twice about buying Mobil 1. That's just my personal opinion mind.

Hope that helps...
Joe90_guy05/08/2019 20:19

Apologies for the delay. Today just got busy real quickly. Regarding …Apologies for the delay. Today just got busy real quickly. Regarding Fuchs, Mobil or Castrol...On no other basis that they (with the exception of a couple of notable arseholes) were the most fun company to run oil development programs for, I'd say Castrol. They were better before BP bought them but they have retained a degree of technical expertise & were always highly receptive to new ideas. If you go for one of their top-tier oils, it will deliver.Fuchs I did a bit for in The Middle East but I always felt they were too small to be the real deal in terms of true understanding & expertise. Mobil as such haven't existed for over 20 years as they 'merged' with Exxon (Esso to you & me). This is a good thing because the one meeting I had with Mobil proper, was like sitting down with The Sopranos! Horrible, nasty, thuggish people who were best avoided! Exxon rely on their in-house lube add company to do most of their engine oil development. Having had the misfortune to meet a few of these individuals & discovered some of the things they do, I might think twice about buying Mobil 1. That's just my personal opinion mind.Hope that helps...


Interesting! What do you make of the Amsol oils then? Opie seem to be well respected hence my faith in them suggesting oils for my old Subaru which I do NOT want to have to replace the engine in again
Amsoil are really well known in the US. If I remember correctly, it was founded in the '60s by a USAF pilot who decided to put military grade aircraft lubricant oil in his automobile. Unsurprisingly, the PAO-based oil was infinitely better than the really grotty mineral oils that were the norm back then (especially in their nut-numbing winters). Whilst Amsoil were the first to actually do it, it was Mobil (with Mobil 1) who capitalised on the full synthetic idea & grew the market.

I never had any direct dealings with Amsoil but this is what I've gleaned over the years. They're primarily a small, niche blender which buys in its raw materials & tech. Their products aren't necessarily 'approved' in the way most lubes are. For example they have oils that contain high levels of ZDDP which fall foul of the ILSAC/API specs. However their retail advertising presence in the US is HUGE relative to their minnow status! Just look at what they do on YouTube.

Are their oils any good? Yes. Would they do any harm? Probably not but with unapproved products, you never can tell. Would I believe the hype? Absolutely not! Would I buy an Amsoil oil? At those prices?? Never in a million years!
Edited by: "Joe90_guy" 6th Aug
Is this oil UK produced ?
ansonuk106/08/2019 10:33

Is this oil UK produced ?


If you had been paying attention, you would have read that virtually nothing that goes into engine oil is actually manufactured here. It's the same for your TV, your phone, your laptop, your kitchen appliances & endless other stuff.

Having said that, the two biggest GLOBAL (note that word!) suppliers of engine oil, Shell & Castrol, have a strong connection to the UK, make pots of money & pay UK taxes. And they manage to do this without making stuff in this insignificant, manufacturing pygmy of an island.

I'm sorry if this doesn't accord to your revolutionary, post-truth, narrow minded political world view but it's how it is. Get over it & stop holding the rest of us back!
Joe90_guy06/08/2019 10:54

If you had been paying attention, you would have read that virtually …If you had been paying attention, you would have read that virtually nothing that goes into engine oil is actually manufactured here. It's the same for your TV, your phone, your laptop, your kitchen appliances & endless other stuff.Having said that, the two biggest GLOBAL (note that word!) suppliers of engine oil, Shell & Castrol, have a strong connection to the UK, make pots of money & pay UK taxes. And they manage to do this without making stuff in this insignificant, manufacturing pygmy of an island. I'm sorry if this doesn't accord to your revolutionary, post-truth, narrow minded political world view but it's how it is. Get over it & stop holding the rest of us back!


Sorry I've not got a Doctorate in Advanced Lubricant Technology. Try going back to bed and getting out again this time on the right side
Edited by: "ansonuk1" 6th Aug
Joe90_guy06/08/2019 08:54

Amsoil are really well known in the US. If I remember correctly, it was …Amsoil are really well known in the US. If I remember correctly, it was founded in the '60s by a USAF pilot who decided to put military grade aircraft lubricant oil in his automobile. Unsurprisingly, the PAO-based oil was infinitely better than the really grotty mineral oils that were the norm back then (especially in their nut-numbing winters). Whilst Amsoil were the first to actually do it, it was Mobil (with Mobil 1) who capitalised on the full synthetic idea & grew the market.I never had any direct dealings with Amsoil but this is what I've gleaned over the years. They're primarily a small, niche blender which buys in its raw materials & tech. Their products aren't necessarily 'approved' in the way most lubes are. For example they have oils that contain high levels of ZDDP which fall foul of the ILSAC/API specs. However their retail advertising presence in the US is HUGE relative to their minnow status! Just look at what they do on YouTube.Are their oils any good? Yes. Would they do any harm? Probably not but with unapproved products, you never can tell. Would I believe the hype? Absolutely not! Would I buy an Amsoil oil? At those prices?? Never in a million years!


Their high ZDDP products would be unnecessary in my nineties engines I'd say, I'll maybe try Castrol oils again in future for my boosted cars; the Edge Ti I put in her 1.2L Micra after a flush (controversial?) has made it feel as great as a 1.2L non turbo can
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