Is oil. oil?

[Texasmark]

As many of you know, or heard about, flat tappet and cam wear has been linked to reduced levels of ZDDP in oils. ZDDP tends to reduce the life of converters, thus the reason for reducing the levels in automotive oils. Diesel rated oils still have a higher level of ZDDP than gas engine oils. There are a lot of diesels running around with flat tappet engines, so higher levels of ZDDP are still needed. I assume that Shell doesn't want to stick their neck out even though they rate Rotella for gasoline engine use. Obviously, there are a lot of gas engines around that don't have converters. I've used T6 for 20 years with no converter failures. It would nice if somebody would question Shell for the specs on Rotella products.

Interesting comment on cam wear. My truck is a 2011 Silverado, one of the years the US Gov. was running GM, and it's a simple push rod MPFI V8, computer controlled, with no fancy stuff. However it does have the rollers on the lifter-cam interface and is rated up to 6k rpm. Thought that interesting being on the bottom of the stack of V8 engines in a 1500 2wd truck.

Oh, the other thing is they (must have learned from Dodge Ram) they realized that an engine is an air pump....air in-air out. So they opened up the air intake, opened the engine ports, and opened the exhaust system so that engine could breathe and breath it does. Really super acceleration from that baby.