Originally Posted By: turbodevil
Hello all, been a long time since I've checked these forums. Good to see my beloved GC still reigns supreme (in VW apps at least).
I found these threads after researching the same general concept as the OP: which oil will cause the least amount of carbon buildup in a VAG 2.0T. I am also interested in preventing cam and follower wear (FSI engine).
Background: I got interested in oil while owning a 97 A4 1.8T. I bought the car used right around the time the sludge issues were brought to light. Ran auto-rx, rotella flush, GC green->good to go. Used GC for the rest of the time I owned it and had 0 oil related problems.
I currently own a 2008 GTI (BPY FSI), bought new in 08. I moved to a place where I couldn't work on my car anymore and started taking it to a VW/Audi repair shop for maintenance. I wanted to keep the car stock through warranty at least and dropped off the forums (vortex, golfmkv) so as not to tempt myself. I knew that 10k oci was ridiculous, and had 502 oil changed at 5k. I often supplied my own GC, but sometimes I didn't and got Total, Motul, or (gasp!), even Castrol 5w40.
The car now has 75k miles. I get 32 mpg mostly highway, accelerating rapidly (not WOT) up to cruising speed. It's time for plugs (again) and coilpacks, but that's about it (piston DV too).
Why am I researching this stuff now, after I've owned the car for 5 years? Because I started checking forums again and saw that there were known issues with the engine that I haven't encountered. And why not? Who knows. What I do know is that I followed the manufacturer's advice: always at least 91 octane, 95+% of the time it's Shell V-Power; got the PCV fix a few years back; use 502 oils only; check the oil at the pump; use techron or similar one tank before an oil change; drive the [censored] car like it's meant to be driven.
My advice to you: follow the maintenance schedule in the manual. Change the oil in between 10k service with an approved oil and oem filter (receipts). If/when something wears out (like the cam follower in FSI's), you'll show you took proper care of the engine and the TSI might get a warranty extension on that part like the FSI did with the cam follower (120k miles). If you start throwing brand X awesome oil in to prevent carbon buildup, VW could say the unapproved oil lead to whatever part failure and then you're SOL. Stop worrying about the carbon build up. It's allegedly inevitable. If you own the car after 4 years and want to treat yourself, clean it out or pay to have it done.
And 1 more thing: GC vs M1 0w40: back in the day I understood GC to be a thick 30, while M1 was a thin 40. People said their 1.8T's ran quieter and had better mileage with GC. It was also green and made in Germany (like the car!). Now it is gold and still made in Germany and my FSI loves it. The car also starts at -15F.
Oops: 1 more: You bought the car for some reason or another. VW's have quirks, especially 100HP/liter ones. VAG considers 1000 mile consumption normal. Deal with this or buy a different car.
Good luck to you OP. If you want to test your theory, stick with the (502) oil you think will lead to the least amount of carbon buildup and check the valves every xxx miles. If yours are better than others at similar mileage, you win!
Thank you for taking the time to respond to my post my fellow GTI brother.
I too am staying out of the forums for the mk6 to not get tempted. Personally I don't find this platform to be very mod friendly for one and 2 VW won't cover nothing if you do. I was considering a APR stage 1 tune and that would be it, but with the horror stories I have heard about lack of VW support even for basic bolt on mods? Forget it not worth the issue. In my Evo's all of which had around 360-400 awhp I would go to the dealer only for stuff I couldn't do. Even with my mods Mitsubishi never questioned anything. They even noticed my Brembo brakes had started peeling (probably from excessive heat from track duty) they replace ALL my calipers no questions asked. I even had a Mitdubishi engineer test drive my car because he wanted to see how the driving dynamics were of the car. He saw my tune on his laptop asked me about it said whoever tuned it did an excellent job and handed my keys back. Where as VW tries to give you lip over an intake or an exhaust. Though I didn't buy this car to mod I always felt being a "hot hatch" with a turbo 2.0 would be crying for mods. Now though I'm not too sure.
As for oil I have heard almost every VW owner say they LOVE GC even though it's not green any more ha ha. I have been using the M1 0w40 because it's easily found and has approvals I need. Maybe I will try the GC next time around. Is the NOACK around the same as the M1? The info I found on M1 was from a euro vw site and must be old info. If the current M1 NOACK is 8.8% that's better than I thought by far.
Is there some other reason why the GC would be a better choice for the TSI? Of course it would be opinion but still would like some insight on that.
And Quattro Pete if you read this I apologize for coming off as a jerk didn't mean to. Just taking things too seriously here and I shouldn't.
Thanks everyone for your help and input.
Jeff