Very interesting UOA.
Setup is Amsoil TS Air Filter, with Mann Cartridge Oil Filter, and BE-90 Bypass Filter. 1/2 quart make-up oil, no filter changes, and mostly highway driving.
Lab suggested changing oil and filters.
My take: IMO, the Al, Fe, Cr, Ni, and Na are all elevated because of some dirt ingestion. The dirt is possibly depleting the TBN, bumping up the viscosity, and raising the Nitration levels. The Si is probably low because the Bypass Filter is filtering out the dirt, but the presence of the Ni, and the elevated Al, Fe, Cr, and Na levels IMO indicate some type of dirt ingestion.
Car is currently running Amsoil AFL 5w-40 with the Mann Cartridge Oil Filter but NO bypass. The stock paper air filter has been reinstalled, and a sample will be taken within 5000 miles.
Again, this is Michael Wan posting for Michael Sparks.
Michael