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.
Anyway, when I had my Passat 1.8T and sludge issues were the big fad, my oil of choice was Valvoline Synpower 5w40. It met 502 and was not a synthetic blend but rather a real synthetic.
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 use valvoline because it's common and it does the job. My auto mechanics instructor also recommended it because he said most of the engines he'd taken apart that had run valvoline looked pretty crud free.
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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