RE: Lucas Oil additive???
Lucas oil is a simple thickiner.
If your book recommends SAE 30 and you add Lucas , you are simply home brewing 40wt oil.
Fine near "the End" to cut down on oil consumption , hide knocking bearings or restore some compression and stop visible smoke..
Most engines will last longest with a straight weight oil, but cold starts are not as easy , and synthetic multi viscosity does give 2-3% better fuel burn.
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