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run what the manufacturer recomends, especially in new cars. tight tolerances, no cam bearings, hydraulically operated cam phasers all depend on...
sounds like a rotted away ground or bad battery connection to me!
the guys that fix them here are great, cant tell where the dings were at all. but thats on new cars with thin sheetmetal
brad penn makes high zinc oils for flat tappets, i run 30wt for break in and 10w30 in my aircooled engine and i have very high spring pressures....
push the little schrader valve in with a pocket screwdriver to see if its charged. most shops now dont even have the proper equipment to...