If new oils, with reduced zinc etc., are lacking in lubrication quality, why is it that engines are not being destroyed at a high rate?
Wear falls into two categories – catastrophic and non-catastrophic. Ever since the creation of the API SL standard, there have been more catastrophic cam and lifter failures from poor boundary (metal-to-metal contact) lubrication as well as corrosive bearing wear in areas with hydrodynamic lubrication. One industry wide solution was the supplemental use of EOS or switching to a racing oil, CI-4 diesel oil, or the use of oils specifically designed for older engines, like Brad Penn. Some companies, ours included, looked towards coatings for bearings and friction surfaces to remediate the problem, or even cutting edge materials like sintered silicon nitride composite followers to remove the wear component all together. The other failure mode of engines with these poor performing lubricants was in non-catastrophic, measured in increased wear, as in bearings, cams, lifters, rockers, etc. all showing wear indicative of very high mileage or severe use in very few hours. The problem here is th
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