Tom, I use Rotella-T (15w40) In the old days I always used Castrol when it was green. I think it has changed ownership and is not the Castrol it was before (JMO). Even the new version of Rotella is still better than the rest in my opinion because of more zinc. Mobil Delvac and Chevron Delo is also a good choice. I believe they are all diesel oils. Brad Penn is also very good. It is a PA. based oil. Go to Yahoo search and type it in. Nice website.
