moribundman
Thread starter
- Joined
- Jun 2, 2003
- Messages
- 23,591
I wish I could give you more information, but it's hard to come by and I've spilled all the beans I had.
From what I heard, VW 504/507 has a sulphated ash limit of 0.5%. TBN appears to generally be around 5-6, which is pretty low. I can only presume that these formulations work very well with the latest engines that were designed with this type oil in mind, but as I said, I doubt that backwards compatibility implies that these new oils are ideal for other engines.