There seems to be a general view that changing oil between service light indications is a good thing for the E39 - and I agree. However, I've been offered Texaco Havoline fully synthetic 5w-40 oil at a brilliant price and I just wondered if anyone out there has any experience of using this in their car. It has a "BMW Long-life" accreditation amongst all the other usual standards.....anyone with any views on this?

Thanks for the help!