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My 83 has lifter noise sometimes after not running for 5 or more minutes, but so far its always gone away eventually. I run Rotella 20w50 non synthetic and add some Marvel Mystery oil once in a great while. My 83 is non interference and stock cam so I am not messing with it until its a real problem.
Generally many people have had trouble with low viscosity oil in the 928, I would not do it.
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