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.
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.
Just did a major service using castrol 10w40 Maganetec with new Iradium spark plugs etc. Car is super smooth & pulls strings & no overheating.
I recommend 5W40 Castrol Syntec! Here's why: Smaller numbers = thinner oil. The "W" means "Winter" - or the viscosity of the oil when the engine is cranking, and first warming up. The 5W oil is very thin when cold. The engine will crank faster, the pump primes better. The hydraulic lifters in your 16v will fill up and follow the camshaft better and with less noise. When you are at operating temperature, the 40 weight oil will give you the protection that a VW engine needs.
I use 5w-40 Castrol Syntec without any issues.
Edge worked great for me. Maybe the best oil on the market.
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