I read on how to change the Lower Unit Oil myself, but one of my questions is.  At what angle do you put the motor when your filling the oil back into the drain/fill hole.  Do you put the motor straight horizontal?  Then you stop when it starts coming out the vent hole.

Motor is down vertical. Make life simple for yourself and go to Wal-Mart and get one of there $10 pumps back where the OB oil is. Pump it in from the bottom until it comes out the plug hole in the top. Put the plug back in the top, (this helps keep it from coming out of the bottom so fast) remove the fill hose from the bottom and put the plug back in it. Make sure you have enough lube, some of the bigger V-6 cases take almost three pints.   Also, if you want to save a few bucks, go by the parts store and get 85 - 90 GL5 synthetic.  I've been running Valvoline Synthethic for about as long as they've been making it and ran their fosil base GL5 before that, even in motors running over 300 hp and turning over 7,000 rpm and never had a LU failure.

Thats crazy, it just seems like you would tilt the motor up to put the oil in.  Seems like it would come pouring out just as fast as you put it in.

Ben, I read someplace that if you put the vent plug in before you fill the oil, you will have air bubbles and as far as I know, that would NOT be a good thing.

You want the motor down and level.  You fill it from the bottom plug so nothing is going to come out until it reaches the top plug, where it's suppose to be filled to.  

Read my post again, I didn't say put the top vent plug in before, I said after you have filled it and it's coming out the top hole, put the plug in to keep if from coming out the bottom as fast.  this makes it easir to get the fill tube out and plug in without so much coming out while trying to make the change.

Thanks

I do mine exactly the same way Ben does his.

JT Bagwell

Right on Ben..when you put the top plug in, the vaccuum will slow down it running out of the bottom hole, just like emptying a gas can...that is why they have a "vent"!