All I know is I was looking for some 10-30 diesel oil. The only thing Walmart sells is a synthetic blend. I emailed them about the percentage of synthetic........never got a reply.

I have been running it in my '93 Corolla that has 161K on it. I just bought it 9000mi ago. The original owner used to substitute a quart of oil with Duralube according to the documentation that came with it.

I have been using 15-40 Valvoline in the Cummins.

Roller cam engines don't need as much zinc? OHC's? No idea.

"The only thing to do for triumph of evil is for good men to do nothing"

"NUNQUAM NON PARATUS!"