Originally Posted by kpack
Thank you for your answers. Maybe I should have said any oil , why is it so hard to know what's inside ? I guess black stone is the answer.
Current Passenger car oil will all be the same, all with low percent of ZDDP - give or take a little.
Now when you get in to Racing, ATV, Motorbike, Lawnmower and Boat engine
and Special rebuilder's Break-in Oil and Classic Hot rod.
That's where you may see a big difference. Maybe around 0.1 > 0.2 % Phosphorous
But if its API SM or SN in a 5w30 or 10w30 grade It will be low ZDDP below 0.08% Phosphorous
Now, you can just buy break-in additive from a Camshaft company ( like Crower ) to add ZDP to anything.
It get's depleted with Hard Use, so you can give it a Monthly dose
Or when ever its feeling "ill"
Like a Vitamin.
- Ken