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Viscosity (W) is NOT what it's all about!!! Read up on "OIL Grading" & the API Rating System. I almost hate to mention Synthetics & H,D. in the same breath (because they leak so damned bad)but if U have NO Leaks, the Synthetic will polish all moving parts, transfer heat better, clean sludge, restore suppleness to the seals, better gas mileage & power & give U a smooth running machine that U may have to turn the "Idle Speed" down on. John
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