Originally Posted By: Finklejag
You got me a little scared now saaber1 with all this valve deposit talk. ... the Motul line....
re: Motul I would look to Motul X-lite 0w30 (502 approved and ester based) or 300V (not approved as I recall). These are ester based and I believe an ester based oil such as the motul x-lite or biosyn, etc. will hold up better to the fuel dilution and the abuse this engine dishes out. They are typically low in volatility as well.
re: valve deposits, your car is no worse off than the Porsche DI, BMW DI, Mazda DI, and probably every other DI engine out there except Lexus and toyota. No fuel to wash the valves + recirculating crankcases gases = intake valve deposits.
All these engines are in the same boat, the only difference is the vw/audi engines have been out longer and there are folks like Rl_RS4 that have done tons of work to identify the problem. So we know about the issue in the vw/audi probably more than any other DI engine.
If you stop the problem by eliminating pcv gas return to the intake tract, the problem is solved. Or you can adopt a program to treat the systems which is more work. I outlined the options below. I'm in your area so you are welcome to check out my 08 GTI which has the pcv system bypassed to the exhaust. I prefer this method because it permanently solves the problem. A vent to atmosphere catch can is another approach that solves the problem but has no vacuum to evacuate crankcase gasses.
Here is a video of the BG induction service that Crew219 found on VW vortex
http://www.vimeo.com/3989681
Also, here are the techniques I know of to deal with valve deposits (from the audi/Mikeinaustin thread):
Some very easy/low cost preventative options that can help but will not solve the DI valve deposit problems:
1) Use a low volatility and good cleaning oil (cost: additional $5-$10 per oil change)
2) Seafoam, lubro moly valve cleaner, water, etc. through the intake at every oil change (cost: $3.50-$10)
3) Regular italian tuneups (cost: gas)
4) Catch can (all kinds of flavors out there) (cost: $30-$300)
5) Fuel injector cleaner in the gas to deal with fuel injector deposits (will not help with intake valve or intake deposits) (cost:$5-$10)
More difficult/expensive "helping but not solving options"
6) BG induction service or similar (cost: $135-$250?)
7) water/meth injection (cost: ???)
8) remove intake and clean valves every 50k or so (cost: ????)
Some one-time-fix-the-problem options:
1) bypass pcv and route to exhaust (search for saaber2 thread "bypassing pcv") (cost $125-$175)
2) Run a catch can that vents to atmosphere ((may increase build up acids in oil due to lack of vacuum in evacuating crankcase gasses (but that is unknown)?)? may have smell or freezing issues?) (cost: $300?)
3) Run a "down tube" or "road tube" that vents to atmosphere ((may increase build up acids in oil due to lack of vacuum in evacuating crankcase gasses (but that is unknown)?) (cost: $25 -$50)