As I have said in other threads, anything in about the top 40 of the list (w/o the additives tests) or about top 45 in the complete list would be a good choice.
Pennzoil has stated that lifter to lobe contact pressures can exceed 200,000 PSI at the point of contact (actual contact patch), so RAT's numbers can not be the be-all, end-all as none of his tests in his rig come up to that value. It has to be something else...
It's very likely the anti-wear (AW) part of the Add Pak that is doing the work at those pressures. Most AW agents take heat cycles to "bake on", so that is not happening for new cams/lifters (any type).
So we're looking for oils with a lot of engines running and few cam failures, even with increased spring pressures, etc. Those running healthy engines with no, or very few failures, will be the ones to watch ...
I have not assembled a really strong engine since these new oils came out. I know what is working in what I already have, but I have a new build on the way in the next year or so ...
This is not a trivial thing and it will only get worse as the Gov't mandates new requirements that the Oil Companies try to solve in different ways ... Since we are into API SN oils with pretty low levels of Phosphorus and Zinc already, they are all scrambling for better solutions. Some are doing better than others, so we'll see...
