Originally Posted By: saaber1
Originally Posted By: ARH_0700
Thanks everyone for all the advice! I guess this forum has made me a bit paranoid about these DI engines and all the talk about fuel dilution. I have a lot of M1 0w40 so I'll run that next and possibly do a UOA to see how it holds up at 5000 miles. If it holds up well I may consider 7500 miles next. And yes, I know about oil cost in Europe - I'm European and spend much time there. That's one of the reasons I am not afraid to do a few extra oil changes per year, it will not break the bank by any means
The other reason is that the car is paid for, it is not leased, so it will remain in the family for a while and I want to take the best care of this very expensive engine.
IMO you are smart to be concerned about intake deposits and you are smart to do a UOA when running M1 0W40. Don't just take it on authority form the manufacturer. BMW has now well known valve deposit problems in their DI engines despite owners maintaining them per the book. You are wise to educate yourself and don't just accept that the "manufacturer knows best". It simply is not accurate in terms of the oil requirements for these engines. THe engineers probably know better but for that to get through marketing, corporate politics, cultural barriers etc and down to the consumer, it is not happening. Ignorance is bliss for their customers. Here is some more information:
Originally Posted By: saaber1
Here is what happens when you simply take it on authority that the owners manual is correct. This U.S. 2.0FSI ran 502 approved M1 0W40 according to the manual, changing every 10k miles:
Here are some interesting related quotes from Terry Dyson re: the M1 0W40 use in a DI engine:
"reb03, the M1 0w40 should not be run longer than 1000 miles to be safe.. Audi and BMW know they are having problems but are marketing tied to certain LARGE oil company that sponsors BITOG thus they cannot speak out about it."
"reb03, I have customers running BMW5w30, M1 0w40 all with the same effect, the wear control is good if we change the oil at 1000 mile intervals but the deposit formation from REAL volatility issues are slowly damaging the engines. I just worked a 07 335 Biturbo yesterday USING ASTM lab tests on the used oil and M1 0w40 went from VOA flash of 430+F to 280 F in 1150 miles, oil sheared to 12.1 cSt and fuel was at 1.99% by IR."
Found in this thread:
http://www.bobistheoilguy.com/forums/ubb...1179#Post981179
a couple more pertinent threads:
http://www.bobistheoilguy.com/forums/ubb...346#Post1692346
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1702540&page=2
Very hard to believe that any modern engine would require an oil change at 1000 miles running M1 0W40 oil. A terrible engineering job, IMHO. I thought these intervals went out 60 years ago.