| Re: [GMCnet] Re: Oil Pressure Poll [message #366659 is a reply to message #366653] |
Thu, 09 September 2021 21:55  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
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Dave Stragand wrote on Thu, 09 September 2021 18:57For what it’s worth, around 2007 I put 75,000 miles in 2 years a 1968 Cadillac with a 472. I did have severe cam lobe rounding and lifter damage using standard oils.
At the time, the conventional wisdom was that the ZDDP additives were only needed during break-in of a new cam. Based on my experience, I feel differently and will only use ZDDP oils on any of my pre-2000 vehicles. I’ve yet to see anything that says ZDDP will HURT those vehicles (as they were designed for oil with it) so there’s that.
Lots of info and opinions out there for those who’d like to research it for themselves, so please read up on it or ask questions if you have any concerns.
-Dave
1978 Transmode near Pittsburgh
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I think it is important to note, just because in the old days ZDDP was needed in oils to assist wear characteristics, doesn’t mean that it is needed in todays oils. Oils have improved immensely over the years. Todays knowledge of chemistry and engineering have created oil blends that give us oils that far exceed the wear characteristics of yesterday’s blends. Todays blends have chemical replacement elements that duplicate the elements of ZDDP, so there may be only traces or no ZDDP in todays oils, yet have extremely high wear characteristics. So, IMO ZDDP is a nonessential element/blend unless engineered into the blend as part of the overall chemistry by chemical engineers. JWIT
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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