The diesel I buy today is a mix of up to 7% RME (Biodiesel) and pure diesel. Pure diesel is not sold any longer. I have heard that there is risk with RME in old tractors. RME seems to destroy rubber hoses and seals. My 4340 is from 1993 and the question is what to do to keep it in a good running shape.
Hazze
Hazze