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castrol gtx engine oil 10w40 £5.50 2 litres, instore @ Tesco
castrol gtx engine oil 10w40 £5.50 2 litres, instore @ Tesco

castrol gtx engine oil 10w40 £5.50 2 litres, instore @ Tesco

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Just got some from tesco pengam green in cardiff. marked as half price. also had magnatec for half price too, redex engine cleaners too. This was on dedicated promotional shelfs so I assume its nationwide.

15 Comments

need sone redex, will have a look

Cheers!

Is this fully or semi synthetic?

Original Poster

Matt.Wild;8851842

Is this fully or semi synthetic?



Someone correct me if i'm wrong but this is semi synthetic- can't check as it's in my boot & I'm in work.

They had redex cleaners half price, both diesel & petrol types

The magnatec was more expensive & I'm assuming thats fully synthetic

manfrom;8852066

Someone correct me if i'm wrong but this is semi synthetic- can't check … Someone correct me if i'm wrong but this is semi synthetic- can't check as it's in my boot & I'm in work.They had redex cleaners half price, both diesel & petrol typesThe magnatec was more expensive & I'm assuming thats fully synthetic



Will check that out as I need full.

Matt.Wild;8852269

Will check that out as I need full.



I think that gtx is a mineral oil. Neither semi nor fully synthetic I'm afraid.

It says semi-synthetic on the can. People get way too precious about oil, as long as it's the right grade and changed regularly you can't go far wrong.
This is cheap for good quality.

I thought magnatec is semi-syntetic, and edge is fully synthetic

Banned

GTX is part synthetic (they say this because the cannot guarantee its completely mineral oil. also means they can charge more for their Classic 20w50 mineral oil.)
Magnetec is semi synth apart from 5w30 which is fully
Edge is fully

joedredd;8852523

It says semi-synthetic on the can. People get way too precious about oil, … It says semi-synthetic on the can. People get way too precious about oil, as long as it's the right grade and changed regularly you can't go far wrong.This is cheap for good quality.



With a modified engine that runs above spec it pays to be cautious matey - normally tho, i'd agree :thumbsup:

sorry for being daft guys but can this be used in diesel engines?

wow this is cheap, great buy. have some heat

the_weasel;8855235

sorry for being daft guys but can this be used in diesel engines?



Generally only if it says on the tin.

the_weasel

sorry for being daft guys but can this be used in diesel engines?



I got some to use in my diesel Vectra, It says petrol and Diesel on the bottle

Castro is a BP brand. Worth boycotting I think.

Also GTX is not very good oil, you guys should really be using Magnetec or similar. Try Total Quartz 7000 or 9000.
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