I dont know if this is news to anybody but it was to me. Castrol is now makeing a 10w 40 oil for Diesels. The guy that I sold my 96' GMC to works for a Castrol bottling plant and gave me a case. He said they had just started bottling it.;)

I know that Castrol makes a formulation specifically for TDI's - actually has the TDI logo on the bottle. I forget what the weight was, though...