I run 10w-40 castrol gtx been running it for the past 5 years I drive a 2011 wrx
ran Castrol 20w50 GTX in my 2.4 Naps Z D21 since new the mechanic who put on new head gasket w/215.000 due to a bad radiator said engine looked brand new inside
Used 5w40 castrol for most its life, but vw504 standard is good too. Using it now and the old man says it runs good.
My Mazda3 which I service myself now, Castrol edge 5w-30 and feels happier. Same engine too.
I always used blue "german" coolant in my e90 bmw oddly it also recommended Castrol oil. Specifically called for it in oil cap
i drive 85% freeway so i change the oil and oil filter every 7500 miles using Castrol Edge 0W-20 synthetic oil since 2017 no vehicle issue.
I put Castrol euro 5w-50 made for BMW and it's 6-7 liters and change it every 5000km I have a 2003 330ci and it still runs like new
5w40 VW 502 spec. Audi recommends Castrol so that's what I use.
Any 5w30 that’s c2 or c3 rated will do, that said I’ve heard negative reviews around the quality of castrol so maybe spend just a little bit extra and get something mid range, I use Fuchs Titan GT1 FLEX C23 5w-30.
Forget Castrol LL! Its a VAG Killer Oil. In this Case Mobil 1
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