audiboy86 wrote:
Please show me one case in Europe where there are tons of these engines that a case of rocker failure has occured? I can show you multiple US cases where it has occured with people following the user manual and oil specs to the letter. I will continue to use atleast a 5w-40 and heavier especially after i do my head swap here in a few weeks.
Please show us a proven case in the US where 0W 40 has indeed ruined the engine. There has been lots of speculation on this, however, there has been no proof to date. Again, I feel it's a combination of the long oil change intervals and an operating EGR system. I think The EGR system itself is the cause most of the troubles. The 5W 40 oil may actually stand up to the EGR soot issues slightly better, but there have been reported failures with those using 5W 40 also. I have used 0W 40 for years in other European engines. Both gas and diesel, TDI's, turbos, et cetera. Never a single problem. Additionally, I have rebuilt quite a few diesel engines, particularly 50 diesel engines, made by VW Audi. These engines are known for serious where issues especially when using 15W 40 oil. I have ran 0W 40 in several of these engines, and have opened them up after hundreds of thousands of miles, and there is no detectable or measurable wear. The use no oil, and compression is as good as the day it was rebuilt. I have yet to have to open a TDI engine up with 0w40. I no longer own a TDI, unfortunately. If I owned one of the pre-2004 nine PD TDI's, I would certainly run 0W 40 in it. Again, I see no trouble with 0W 40 or 5w 40 without worry. These are simply my real-world observations, take it for what it's worth.

Once again, let the oil debate resume!