PTRider
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I'm not sure Lucas 20W-50 PLUS would be OK in a motorcycle clutch due to the high level of anti friction additive. Lucas red label 20W-50 or their motorcycle 20W-50 are listed on their data sheet as being OK.
I'm not a Lucas fan anyway, and I don't know who's blending the oil for them nor exactly what is in it. I'd rather use a 5W-40 diesel synthetic motor oil or any xW-50 syn motorcycle oil. Lucas seems to be more hype than fact from what I've seen. I've seen examples of how their oil stabilizer causes foaming in gear oil, and never had any oil that needed to be stabilized, anyway. My policy is that none of us can home-brew better oil than the oil company chemists can blend to meet any specified price point. If I want better oil, I buy better oil.
SAE is the Society of Automotive Engineers, and SAE 20W-50 or whatever is technically the correct way to specify an engine oil viscosity grade.
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