I've seen it several places will try and find it
read this Oil | Richard's Corvair
corvair is a proxy for flat tappet Widman is an oil importer- knows his stuff
Thanks a lot. that is a good read, and I will spend more time on it.
There may be some confusion about the calcium additives here.... the article states on page 2 that calcium and magnesium additives are for cleanliness (not EP wear aids) and are polar like ZDDP. I think the point he makes later is that these 2 sets of additives fight each other for 'space' on the surfaces so if you get too much of one, it reduces the effectiveness of the other (page 13). This seems to go hand in hand with the reports of excess ZDDP being bad. There have been discussions here on how much of how much of what additive to use to get the ZDDP levels to around 1300-1500 ppm with oils that start with the lower SN ZDDP levels, which this articles seems to point to as being a good target level (and which seems to be the widely accepted 'happy' level for ZDDP).
BTW, I look at 540RAT's test numbers on occasion, but no longer read his articles since I found one very glaring error in one article. Some if it is interesting (in a good way).
