Hey all,

Ran a poker run last weekend. First 120 miles or so the drive fluid looked pretty good as far as level goes checking it each morning. Pulled the boat off the water to clean up after doing another 80 and the reservoirs both had dropped to the bottom of the bottle.

I've heard of bubbles created during changing the oil. But this is a bit more than that correct? No oil in bilge, no pretty rainbows behind the boat. Wanted a second opinion before taking it in and burning a month of prime summer.

Mine has done this since purchased in 2014. Gear oil drops in bottle to add mark a few times per year and needs topped off. No visible leaks, drive psi tested 15lbs per 30mins, no water in oil. Since adding a drive shower i've noticed it does not drop as much as before.

Did you change lube right before the run?

Not right before but I think this was my second or third time using the boat since the change.

If it was just air from the recent change it should now stabilize. If it continues to drop then it is pushing it out a seal. My drive has been pushing it out the prop shaft seal for some time now. I never see a slick behind the boat. all other seals bone dry. Prop shaft was grooved.

I want to preface I'm not a mechanic. But I have seen the same thing. We have a 7.4mpi Bravo 3. When I run without Captains Call e.g. Exhaust thru the prop the outdrive will fall a little. When I use the thru hull exhaust exclusively. No drop. I have a theory that the extra vacuum created running the thru prop exhaust is causing the slight drop. Not based on any science. We had the outdrive pressure and vacuum checked and all was perfect.

you could have a leak on the input shaft and the oil is collecting in the bellows boot...wont see it till you pull the drive...

I did that dry as a bone. Since I had a coupler go out I've had the engine aligned every other year