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I use Mobil 1 20-50 wt. oil in all three, motor, clutch case and trans. Would it be okay/better to use Mobil 75-140 in the clutch case and trans. I heard it shifts smoother and makes less noise.
 

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No it would not be O.K. to use 75-140 gear oil in the primary (clutch). It will be fine in the gear case though. I have used ATF in the clutch case. Now I use Motul V-Twin primary oil in the primary. Great stuff.
 

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No it would not be O.K. to use 75-140 gear oil in the primary (clutch). It will be fine in the gear case though. I have used ATF in the clutch case. Now I use Motul V-Twin primary oil in the primary. Great stuff.
Thank you, I will try the 75-140 in the trans and keep the 20-50 in the clutch and engine, again Thank you.
 
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