I was surfing a site tonight and ran across an article that they have mandated (back in 2004) ZDDP (Zinc) levels be dropped in Motor Oil. Zinc is considered an anti wear additive.
http://highperformancepontiac.com/tech/hppp_0606_understanding_motor_oil/index1.html
I guess it fouls Catalytic converters.... Only one of my rigs has a cat - and it's got 4 doors and only sips Mobil 1. This is for the 911 and my other rig which is emissions exempt (1970)
That would explain changes in some old favorites (Green Kendall comes to mind) but does anyone have any reccomendations for a good substitute? Motor oil for diesels?
Reason I ask is that I'm doing some research - planning on finishing up a fairly high dollar v-8 shortly and I'd like to keep it running straight. I guess there are a lot of complaints of camshafts going flat quickly without the Zinc.
Lubemaster? Any other Pelicans have any suggestions?
rjp