[The Champ]

Article in Motor Trend on the benefits (or lack there of) on running high ZDDP diesel motor oil in your car:

"Is Diesel Motor Oil the Right Choice for a Gasoline Engine?"

https://www.motortrend.com/how-to/di...765D12CFD72326

I never thought it was a good idea, but after reading this, I understand it's really a bad idea.

Zinc And Engine Speed

Why does this matter? Because the type of ZDDP in a diesel engine oil is not the same as the ZDDP in a gasoline engine oil. This is an important difference; diesel engines run at lower rpm than gasoline engines, so that difference in engine speed changes the way the ZDDP needs to activate to provide anti-wear protection. To get a little technical, diesel engine oils typically contain primary ZDDP and gasoline engine oils contain a blend of secondary and primary ZDDP. Just as a side note, racing oils just contain secondary ZDDP. Both types of ZDDP offer anti-wear protection, but the gasoline type of ZDDP provides more protection for higher-speed engines (think bigger valvesprings).

And it's not just the difference in the kind and amount of ZDDP, it's also the amount of anti-foaming agents. The needs are different between gas and diesel.

And beyond that, there is a difference in the amount of detergent and dispersants between gas and diesel.

It's a quick easy read with a lot of good info.