After a lecture from my mechanic on the virtues of race oils and Castrol GTX 15w-40, I wanted to find out which otc oils would actually meet his customer's specs instead of the olde-school GTX he uses. Heavy 50w film strength seems to be what racers are obessed with. He uses Valvoline Racing 50w and changes 1000-2000 miles and wants nothing to do with Long-Life oils. As far as M1 15w-50 goes, he experienced a cam bearing failure on his S6 and had a 944T sitting there in the shop with a blown engine, M1 red label jug was visible through the rear hatch. So in 50w that leaves Syntec 5w-50 and Synpower 20w-50 for people who are looking to go the 50w synthetic route. The surprise here is the dino oil meeting ACEA 3. I have heard synthetic oil proponets say no way can a dino meet ACEA3, here is the proof- it does. Here is the list I made, please add any ones I missed. Chevron Delo 400 15w-40 Valvoline SynPower 5w-40, 20w-50 Durablend 10w-40, 20w-50 Castrol Syntec 20w-50, 5w-50, 0w-30 (German only) Synthetic Blend 10w-40 Mobil 1 0w-40, 15w-50 It was reported here Quaker State Synthetic 5w-30 meets ACEA 3, but the bottle I checked did not say so, few 30w oils do meet the required 3.5 HT/HS value. Some one should find out if Kendall 5w-40 Full Synth meets it, probally does. I hate PDFs. I hope this helps people decide, and keep away from non-ACEA 3 oils for cars which require tham.