Nov 24, 2013 · Just to add some more thoughts, when I was researching what ZDDP levels were in 20w50 for most "off the shelf" conventional oils available at most retail stores, most PDS's …

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 · This means that if one wishes to maintain .065% minimum phosphorus, more than that must be present in the initial fill. Our calculations estimate that if you start with a ZDDP …

Oct 8, 2014 · Does anyone know the amount of ZDDP in these oils. I was thinking about using a additive. Without knowing the amount off ZDDP I don't want to end up with too much. I've read …

Jun 19, 2012 · The thermal degradation of ZDDPs in service has often been confirmed by 31P NMR and IR studies [45] and is not really important unless decomposition proceeds to the …

Oct 11, 2011 · 2200 ppm of ZDDP is a little high in my view, to the point of being corrosive. I would assume that the "normal" RedLine stuff would have an elevated level of ZDDP in the …

Aug 25, 2018 · In primary ZDDP the attaching carbon has only one carbon neighbor (carbon bond). In secondary ZDDP the attaching carbon has two carbon neighbors (carbon bonds). Its …

May 31, 2017 · ZDDP is an anti wear additive that IS necessary, in a hypothetical scenaria where the boundary lubrication regime breaks down, ZDDP is the last layer of defence, the …

Oct 19, 2005 · What you all taught me was I don't KNOW every fergin thang on this stuff. I thought I was a pretty knock-around guy on the subject having maintained most of my cars over 250K, …

Jan 27, 2022 · Higher ZDDP is not needed for flat tappets/cam over bucket/sliding follower. What warrants the increase in ZDDP levels are higher spring pressures in conjunction with those …