JHZR2
Staff member
Delo is an excellent oil, and Chevron did some good analysis in the past comparing and contrasting the performance of delo 400 vs. D1. That said, IMO there is a fair amount of feel, MPG and operational analysis that should be added. For example, in my 83 MB 300D, I did not like the engine feel with delo 400, and noticed a bit of an MPG dip, compared to rotella and delvac. I ultimately went to D1 in that vehicle, and was happy with UOA results and MPG increases.