Roger K Sterling

Active Member
Oct 23, 2021
Boat Info
2000 Sea Ray 240 Sundancer
Mercruiser 5.0L, Bravo II, Thunderbolt V ignition
Should I change the engine oil and gear oil now or can I wait till Spring.
I was told always change the oil and fluids before you put her away for the winter. Better that all the gears, bearings, etc sit in fresh oil vs potentially contaminated oil.
I have read/been told the same, but never really practiced it. By the time I crawl all over the engine compartment to winterize, I am beat, I go home, and end up not returning to do the oils.

My boat sits for about 3 months winterized though, so maybe that's something to consider, how long will the engines be winterized.
I'd do it now. But I've also let it go on occasion if I only put a few hours on it, ran it another year... and in 40 years of running small block V8s it's never been an issue.

On my very expensive cummins... do it in the fall no mater what.
Motor oil, would not worry about leaving it until spring unless it has been run for hundreds of hours on that oil. Gear lube , now. If there is water in the oil it will crack your gear housing over winter.
Change them before lay up. Inspect what you draw. It could save you in the long run.
The theory is not leaving old oil in the engine during layup. The outdrive is more important to change because if there is a leak, you don't want a mix of oil and water in the outdrive over the winter and freezing temperatures. Our old Correct Craft never got the oil changed in the fall, always in the spring - never an issue in the 2000hrs we put on the original engine.
For me, I change all the fluids in the fall - I already have things out do to the outdrive, so I just do the oil and everything is ready to go in the spring.
I actually brought that up a few weeks ago in a thread because I got hurt mid and July and only put about 5 hours on new motor oil and new drive oil and was told I can just leave it because it has so little time on it

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