Quote: Joe Gibbs is another company that says the ultra-high detergent levels in Diesel oils harm the effectiveness of the ZDDP.
R.
Then why is it that so many users of diesel oils have no problems. Guys, many guys over on the race forum use 15W40 "diesel" HD engine oils and have no problems. Is it only Joe Gibbs that says this? If so, maybe to help their sales? Don't you think if this was a fact that it would be well known? But, yet it isn't. Just saying.
Actually it IS talked about, and has been for years. To me high detergent is a MINOR issue. Low zinc/phosphorus is a MAJOR issue. To answer your main question, DELO oils are better than standard oils, but they are not the best choice. They do work, but if the detergent level was lower they would be even better.
I've used them in the past, but no more. I put a zddp additive into standard valvoline SM rated oil.
