I am a big Rotella T fan as it was recommended to me by my Suzuki mechanic as the next best over the factory marine grade. He stated the only thing the marine grade carried was an encapsulement component for moisture like the lower unit oil. In any case I am approaching 1800 hours on my big 4 stroke with no valve train issues nor any needed adjustments in 10 years.
The only "valve" issue so to speak I ever had came from exaust valve carbon build up from ethanol fuel use. I had a light tick and failed a leak down test on the bottom 2 cylinders. A combination of Ring Free and SeaFoam in a 6 gal can "cocktail" took care of that issue quickly and resolved the sticky valves. I still run cheap gas but add lucas treatment to every other fill and have not had an issue in 5 years. You could have the same issue starting to happen. Maybe a cleansing "cocktail" would be worth a try as it certainly would'nt hurt to de-carbon the motor anyway.
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[b]The Moose is Loose !
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