Nov 24, 2013 · I know the oil companies change their formulations from time to time... What’s the latest news for high ZDDP oils in 2020? Right now my ‘68 Skylark with a rebuilt 462 has …

Nov 22, 2004 · So I have been considering adding some ZDDP to my older vehicles with flat tappets. These are an '87 Buick Grand National (3.8Turbo), 1966 Cadillac Deville (429V8) and …

May 4, 2004 · The oil manufacturers obviously know of the importance of the ZDDP to older flat tappet engines, as many of them are steering owners of these engines toward their ZDDP …

Aug 7, 2020 · Here's an explanation about using ZDDP in an engine. More is not always better, even when the additive is beneficial.

Oct 8, 2014 · I've also read that Valvoline reduced the ZDDP in VR1 is this true does anyone know the amount of ZDDP in VR1 10w30 ? I'm having a hard time finding this information and …

Oct 11, 2011 · Any suggestions on minimimum content of ZDDP should be for a fairly aggressive solid flat tappet cam and ‘heavy’ valve springs? What’s the maximum level before problems (if …

Jan 25, 2014 · It's also a more reactive type of ZDDP. If you want a syn-blend with a good bit of ZDDP, Driven GP-1 is designed for older flat tappet cams. Rotella T6 5w-40 would be your …

Dec 29, 2016 · Unless you have a very old automobile you do not need a high level of ZDDP as modern engine oils have other anti-wear chemistry within them. What is your application, that …

Dec 29, 2010 · There is no good antiwear-additive substitute for ZDDP. But its levels have been dropping because of stricter regulations to protect catalytic converters. Phosphorus is the …

Jun 21, 2017 · Newby here and 1st post. I've been using Shell Rotella T 10w30 in my pre 2000 Cadillac Northstar and 2001 Jeep Wrangler based on info from the Jeep and Cadillac forums …