Slight Burning oil smell
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First thing I'd do is a compression test and compare it to what the manual calls for.Wouldn't us these oil "fortifiers" to solve the problem,plus some can slow down oil delivery through the pump. Best way if it's oil smoke is to find out where it's coming from.Leak down test can really help. If rings are really worn you can hear air hiss through the crankcase vent as air passes rings. Valve guide seals and valves you can hear it through the muffler.