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DaveK · 02-15-2007

I thought I'd go straight to source so to speak and contacted the Mobil support people, here's their response in full.

"Thank you for your inquiry,

The new ILSAC GF-4 motor oils (10W30 and lower viscosities) do have reduced (0.08%) ZDDP in the formulation for longer longevity of the catalyst converter and system. This is not a problem on newer vehicle designs that utilize the roller cam, valve train technology however, if you have flat tappet cam, valve train technology you generally want higher ZDDP levels. Mobil1 15W50's, Mobil1 diesel motor oils, Mobil1 motorcycle motor oils and Mobil1 High Mileage 10W30 and 10W40 have high ZDDP levels and would be the best choices for these engines."

Hope that helps.

02-15-2007	#11
DaveK Join Date: Jul 2004 Location: Sudbury, Ontario. Canada Posts: 1,537	Re: NO ZINK IN THE MOBILE 1 OIL ANYMORE I thought I'd go straight to source so to speak and contacted the Mobil support people, here's their response in full. "Thank you for your inquiry, The new ILSAC GF-4 motor oils (10W30 and lower viscosities) do have reduced (0.08%) ZDDP in the formulation for longer longevity of the catalyst converter and system. This is not a problem on newer vehicle designs that utilize the roller cam, valve train technology however, if you have flat tappet cam, valve train technology you generally want higher ZDDP levels. Mobil1 15W50's, Mobil1 diesel motor oils, Mobil1 motorcycle motor oils and Mobil1 High Mileage 10W30 and 10W40 have high ZDDP levels and would be the best choices for these engines." Hope that helps. __________________ 1991 #1516 Black/Black davidmkelly.com Author of fast-paced, sci-fi thrillers.