I am sticking with 0W30. Plus, it is better for cold start, which is one of the most important things!
Castrol 0W30 Made in germany, or as it is best known "German castrol." It is "thick" 0W30 more going toward 0W40. It is thermaly very stable oil. I used it on Passat B5.5 1.8T (2005) and there is more then obvius difference between "GC" and regular Castrol 5W40. GC so far is the best I used it.
Many dealers use Castrol LL03 5W-30 and it makes a huge difference in MPG. I ran it for 7500 miles and had the oil tested.
I ran Edge 5w-30 in my APR 2.0 TSI last winter, had the used oil tested at CAT afterwards for $13, and it did a great job.
I'm running Amsoil in my 06 GTi and loving it. No trouble with that I can tell, I check dipstick every fillup occasionally have to add some but not a quart, not even .25 of a quart. I've got almost 72k on the clock I did my last oil change around 67500 maybe a little more, and oil is still clean. Car sounds no louder or different from oil dealer had put in it.
Castrol Syntech or Mobil One in 5w30 for the Volvo and 10w30 for the Ford. Mainly because I'm a lazy bastard that hates doing oil changes and the stuff lasts twice as long as regular oil. That, and I've had cars run over 400k using them exclusively.
Castrol edge 5w30 in my Focus
Castrol Edge. My car is very specific about what grade the oil has to be and this seems to be the only one that matches OEM oil.
i run 5-40 amsoil in my VRT as well
Just did a major service using castrol 10w40 Maganetec with new Iradium spark plugs etc. Car is super smooth & pulls strings & no overheating.
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