Auto makers trying to get ZDDP reduced or completely eliminated.

[Hardwyre]

"In order to comply with federal requirements that key emissions control components on new cars such as catalytic converters work (and can be warranted to work) for at least 120,000 miles (previously, it was 100,000 miles) automakers have been pushing for reductions in an oil additive known as zinc dialkyl dithio phosphate (ZDDP), which contains phosphorous (as well as zinc and manganese)."

 

http://epautos.com/2011/10/31/oil-alert-for-older-cars/

[datrod]

Did you even read this from the reply?

 

 

 

 

I think they’re concerned mostly with pushrod engines with flat tappets, because the valve spring pressures are so much higher to deal with all the extra mass of pushrods and rockers.

 

In a OHC/DOHC design the spring tensions are less…

 

But I still like my ZDDP and I’ll be using my Royal Purple HPS or XPR. Screw the catalysts–they’re more easily replaced than my valvetrain!

[68Datsun510]

Mobil 1 15-50 FTW!

[DanielC]

Valvoline VR-1 racing oil is another with good levels of ZDDP.

[FoxyRoadster]

They've been doing this for a while, the VW crowd and various pushrod fans are very aware of it. I know with 2 of my 3 cars having pushrods I'd made myself aware of whats in my oil.

 

 

Also there are additives for it you can get to mix in with your oil.