This customer lives in Canada. He has spent a significant amount of money in freight to get our oil in his 383 Stroker. The engine has 200,000 miles on it. The last 180,000 of those miles is on HPL. The oil filter is NAPA gold. I just received the pictures. I have requested the drain frequency and will post that when I get the info from the customer. The engine is in a Boss Hoss and this guy is a riding animal. He will hop on his bike and ride from Eastern Canada to Arizona or Vegas or Florida on a whim. The oil is our 5W40HD CI4plus/SL. This formula has ester but not AN. It is fair to say that the addition of AN in the current 5W40 will help but its hard to imagine an engine running much cleaner than this. The valve cover was removed and set on the bench and photographed untouched.
David
David