1. Many here say they level the lower unit, and fill from bottom just until it comes out of top vent hole. A 32 oz. bottle will NOT be enough.
a. -Some say they have done this for years with no problems
b. -Others say it "blew"out the top driveshaft or shifter seals.
c. -Yet others say that if you DON'T fill to the vent hole, the top driveshaft bearing and seals will "run dry" and not be lubricated.

2. Dealer, and some others here say measure and fill only 28 oz. It will NOT come out the top vent at 28 oz.

3. Still some others here, say their manual says to fill with 24 oz., even less than above.


Which is correct? Or does it even matter?

Mine is 2007 sporty on 300xs if that matters.