I'm using 3 different oils, so I'm kinda interested to see if its possible to do this.

 

I was told I can use m1 20-50 vtwin oil on all 3 wanted to see if it's the same for Valvoline

 

Save yourself a lot of trouble and worry and use Mobil 1 20/50 V-Twin synthetic in the engine you can get it a Walmart. Belray 80/140 gear lube in the trans and Belray primary + for the primary.

 

OR... THE HARLEY SCREAMING EAGLE synthetic in all three... done...

 

Mobil 1 20/50 V-Twin full synthetic in all three holes. No issues.

Buy it at walmart, good to go.

 

I would not recommend motor oil in the transmission.

 

Yes! Mobil 1 Vtwin in all three holes.

 

Don't understand why the mixed answers with same oil on all 3

 

Another vote for Mobil 1 V-twin 20/50 in all three. Why complicate things to save $1.00 per oil change? Why use motor oil? Because it's actually the same viscosity as the specified gear lube. As long as the Valvoline doesn't have friction modifiers you should be fine with it. You get different opinions because opinions are like ??holes, everyone has one!

 

Shared engine oil does fine in a 250 horsepower Hayabusa. What's up with a Harley or a Baker transmission that it doesn't?