Oil zddp ?

DrCharles said

I know why it was reduced... (and isn't it the phosphorus, not the zinc?).

What I'm asking is if anyone has actually run test engines with Mopar-sized flat tappets and lobe designs, and more aggressive springs (say 130 seat, 350 nose), with varying levels of zinc.
There's a lot of anecdotes along the lines of "I never lost a cam until I used VR-1/didn't add the zinc/bought lifters from Comp", etc. etc.

Click to expand...

Hell no, I wasn't going to test that!

Unless it was dead stock I always run zinc in the oil. BUT BUT BUT....too much zinc is a power killer. I know the VR-1 was anywhere for 8-15 HP down to other oils. So we're the other oils with zinc over 1000 PPM, IIRC.


It's just too expensive to test what your asking. Unless you have fat pockets and want to prove something most people won't believe anyway.