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It has the VW 502 approval, but not the 503.01 -503.01 is the approval for turbo charged Audi's with >180PS. Over the counter: Only 0w30 Castrol Syntec & 0w40 Mobil 1 Euro meet the 503.01 (AFAIK). -Both of these oils have the lower 502 approval as well.

GC meets VW 503.01; which is a higher approval than 502. -503.01 is recommended by Audi for turbocharged petrol cars with more than ~180hp

Guess we are both confused -I read your comment as the "turbo diesel truck" is evidently not "Delvac1" But the link you provided states the complete opposite (that they are the same oil)

http://www.mobiloil.com/USA-English/Moto...ine_Engine.aspx (I'd assume the last sentence has something to do with marketing, but..) Guess I will have to try 0w40 next; and see if I can tell a difference

I see.. they actually call it Delvac-1, interesting.. Regardless: I've been driving for about a week with the 5w40 Turbo Diesel Truck oil. -Not too much to say, other than I have a good feeling about it. Car seems quieter at start-up ... and after a nice flogging through the canyons, its sounds...

I used the gold GC briefly -- No longer available here though ( AZone). -The general "feelings" about the M1 0w40 are making me look out for a better, local, alternative. I will be changing my oil on Monday (with the TD) - I'll post my inital impressions, and try to do a UOA later.

(someone correct me if I am wrong) I believe the M1 5w40 is the Delvac-1 / and I understand the M1 TD is the closest thing to Delvac-1, over-the-counter. -I am not all that familiar with Delvac-1 myself (but noticed it is sold out/no longer avail. on many VW internet sites). My A4 is a 2001.5...

I grabbed some of the 5w40 TD -Traded some Valvoline Synthpower for it (which was previously bought for real cheap). Thought it was MaxLife, but wasn't -- then I couldn't find SynthPower oil treatment to bring up the viscosity / so I swapped it in favor of the 5w40 I am going to fill up with...

Specifically regarding an Audi 1.8T (AWM) chipped engine: -What do you feel would be the best over-the-counter oil for me? (note: engine has 90k+ miles) I understand the 0w40 has been sheering closer to a w30 -- others have noted that the engine seems louder with this oil as well. -Even though...

I noticed that it does not carry the "VW 503 01" approval (a la GC 0w30 or M1 0w40). -But agree, it would likely be fine. I did however exchange the Syntec for Valvoline SynthPower 10w30. -AZ was running a deal (5qts + fram "toughgaurd" filter) for $18. They didn't have the toughgaurd filter...

What is the deal with the 5w40 Syntec? -claims that it is the "superior german formula, now blended in the states." -looked to have the same approvals (with the exception of a footnote, on the porsche approval). I picked this stuff up (on sale), with the hopes it is just as good -- but also...