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Castrol MAGNATEC Engine Oil 10W-40 A3/B4, 4L £18.19 prime / £22.94 non prime @ Amazon
Castrol MAGNATEC Engine Oil 10W-40 A3/B4, 4L £18.19 prime / £22.94 non prime @ Amazon

Castrol MAGNATEC Engine Oil 10W-40 A3/B4, 4L £18.19 prime / £22.94 non prime @ Amazon

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Found this after seeing another thread for Castrol Edge by batezy_1984

Unfortunately, that oil isn't suitable for my car so did a search and found this (which I was about to go and buy at Halfords for £29.99!)

Castrol Magnatec protects your engine from the moment you turn the key thanks to the way its Intelligent Molecules cling and bond to critical engine parts. Castrol Magnatec protects against engine wear... before, during and after your journey.

At the start of your journey

Up to 75% of engine wear occurs while your engine warms up. But Castrol Magnatec’s Intelligent Molecules cling to your engine, even when it is off, always protecting and dramatically reducing* engine wear during this critical period.

During your journey

Castrol Magnatec’s Intelligent Molecules continue to cling to your engine after your engine warms up. Castrol Magnatec helps maintain top engine performance by protecting your engine in all driving conditions and at all temperatures.

After your journey

All engine oils will drain to the bottom of your sump when your engine is off but Castrol Magnatec’s Intelligent Molecules keep clinging to critical parts of your engine ready to protect when you start your next journey.

Extensive testing has shown that Castrol Magnatec outperforms API SM industry standards and basic API SM oil. In fact, after running Castrol Magnatec for 100 hours, its Intelligent Molecules offer a stronger layer of protection during warm-up and beyond.

Even if you haven’t been using Castrol Magnatec, it’s worth making the change. Castrol Magnatec’s Intelligent Molecules start working for you the day you change your oil. They cling and bond to engine surfaces, significantly reducing further engine wear and damage to already worn parts.

* As tested in the industry Sequence IVA Wear test.

5 Comments

This stuff is great! I have an old motor where the tappits made a hell of a noise but when I changed to this it purrs! However, when asked my local garage to use this in a service they slated it and even refused to let me supply the oil! Can any mechanics out there explain?

Original Poster

andyperkins1971

This stuff is great! I have an old motor where the tappits made a hell of … This stuff is great! I have an old motor where the tappits made a hell of a noise but when I changed to this it purrs! However, when asked my local garage to use this in a service they slated it and even refused to let me supply the oil! Can any mechanics out there explain?



Depends on you "old motor" - what was it? If the oil specs aren't suitable for the car then the garage may decline as it could cause problems.

As an example, for a Vauxhall Astra Mk4 you can use this stuff (guess what car I have!) - you can also use 5w-40 however for older, poorly maintained cars this may not be a good idea as 5w-40 oil has a lower viscosity when the engine isn't up to temperature, this could cause the engine to burn fuel as it "may" leak through seals where as the thicker oil wouldn't. Now, I'm no mechanic so this is guess work and pieced together from various articles and forums - I'm a keen DIY mechanic.

FYI - the first number relates to the viscosity when cold, the other number relates to the viscosity when at operating temperature...so while 5W-40 is thinner when cold, it's viscosity is the same as 10W-40 once the engine is up to normal operating temperature (both oils rated as 40).

There's also mineral, part-synthetic and fully-synthetic oils - and then there's also the ratings (this oil is A3/B4).

I'm not an expert, but if you do some googling you'll find a whole load of info out there and some good opinions on why one oil is better than another and why it may or may not be suitable for your car.

Hope that helps...but tell me what car you have and I'll google it for you

dotnetter

Depends on you "old motor" - what was it? If the oil specs aren't … Depends on you "old motor" - what was it? If the oil specs aren't suitable for the car then the garage may decline as it could cause problems.As an example, for a Vauxhall Astra Mk4 you can use this stuff (guess what car I have!) - you can also use 5w-40 however for older, poorly maintained cars this may not be a good idea as 5w-40 oil has a lower viscosity when the engine isn't up to temperature, this could cause the engine to burn fuel as it "may" leak through seals where as the thicker oil wouldn't. Now, I'm no mechanic so this is guess work and pieced together from various articles and forums - I'm a keen DIY mechanic.FYI - the first number relates to the viscosity when cold, the other number relates to the viscosity when at operating temperature...so while 5W-40 is thinner when cold, it's viscosity is the same as 10W-40 once the engine is up to normal operating temperature (both oils rated as 40).There's also mineral, part-synthetic and fully-synthetic oils - and then there's also the ratings (this oil is A3/B4).I'm not an expert, but if you do some googling you'll find a whole load of info out there and some good opinions on why one oil is better than another and why it may or may not be suitable for your car.Hope that helps...but tell me what car you have and I'll google it for you



Always astounded with the effort put in by some folk on here!! Many thanks for your reply!!! I have a Vauxhall Zafira 2001 1.6 petrol. The book suggests this viscosity! I also run a 1998 Honda Accord 2.0 SE which specifies the 5/40. It's the Honda which now purrs but I did use the 5/40 as the book suggested, but garage not interested in the Castrol! Very interesting what you're saying about the leaking through seals as we are constantly topping up the Zafira (10/40) yet the garage says there is no leak!!
Thank you again kind sir for bothering to reply - I may have to do some googling or possibly change garage!!!

Original Poster

andyperkins1971

Always astounded with the effort put in by some folk on here!! Many … Always astounded with the effort put in by some folk on here!! Many thanks for your reply!!! I have a Vauxhall Zafira 2001 1.6 petrol. The book suggests this viscosity! I also run a 1998 Honda Accord 2.0 SE which specifies the 5/40. It's the Honda which now purrs but I did use the 5/40 as the book suggested, but garage not interested in the Castrol! Very interesting what you're saying about the leaking through seals as we are constantly topping up the Zafira (10/40) yet the garage says there is no leak!!Thank you again kind sir for bothering to reply - I may have to do some googling or possibly change garage!!!


I had a Zafira a few years ago - money pit!...probably a good car but ours was for ever having problems...I'd have one again though as now I've lived with one, I know what to look for and am now more than capable of doing most work on a car

I think your Zafira has the same engine as my Astra (1.6 16v) but could be wrong - I'll google it in a bit.

How much are you having to top it up...how many miles between topping up? We always had to top our Zafira up - engine management light would come on and it would sound rough as hell! If there's no obvious oil leaks anywhere then it could be burning oil - possibly oil seals on their way out.

I'd have a look under the bonnet, especially around the rocker cover which Vauxhall love to hide with the plastic "ecotec" cover. Also look around the oil filter, it could be loose or not fitted correctly.

If the car is burning oil you'd maybe/possibly see some smoke from the exhaust or you could check your spark plugs to see what colour they are.

Glad I could help - bare in mind though, I'm no mechanic and everything I've learnt has been through having to fix various cars over the years. If in doubt, try a different garage and then google, google and then google some more

Knowledge is power

...just googled and your engine may be the later Z series - mine is the X16XE but given the year of your Zafira I'd say it's more likely the Z16XE...in which case, you might find this interesting...

A Forum thread about excessive oil consumption for the Z16XE Engine
Edited by: "dotnetter" 23rd Nov 2016

dotnetter

I had a Zafira a few years ago - money pit!...probably a good car but … I had a Zafira a few years ago - money pit!...probably a good car but ours was for ever having problems...I'd have one again though as now I've lived with one, I know what to look for and am now more than capable of doing most work on a car :)I think your Zafira has the same engine as my Astra (1.6 16v) but could be wrong - I'll google it in a bit.How much are you having to top it up...how many miles between topping up? We always had to top our Zafira up - engine management light would come on and it would sound rough as hell! If there's no obvious oil leaks anywhere then it could be burning oil - possibly oil seals on their way out.I'd have a look under the bonnet, especially around the rocker cover which Vauxhall love to hide with the plastic "ecotec" cover. Also look around the oil filter, it could be loose or not fitted correctly.If the car is burning oil you'd maybe/possibly see some smoke from the exhaust or you could check your spark plugs to see what colour they are.Glad I could help - bare in mind though, I'm no mechanic and everything I've learnt has been through having to fix various cars over the years. If in doubt, try a different garage and then google, google and then google some more :)Knowledge is power ;)...just googled and your engine may be the later Z series - mine is the X16XE but given the year of your Zafira I'd say it's more likely the Z16XE...in which case, you might find this interesting...A Forum thread about excessive oil consumption for the Z16XE Engine



That link is exactly the situation we have with the Zafira! Incredible really and explains why the garage can't find a leak! I may try revving it at 6000 revs when warm for a minute or so to unclog any oil stuck to the pistons! Just put through theMOT and hand belt and pump changed, it's been a battle bus for us with 4 kids and actually very good on fuel consumption so will persevere!!
Knowledge is indeed power!! Cheers for the link! I may even be brace and change the oil myself to the above mentioned!! (Just to see if it makes any difference)!!
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