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Change oil in Spring or not?
Sooo. Some say even though I put new oil in last fall when I winterized I should change it again in the Spring. I normally wait 25 hours. Thoughts?
My oil is like a year and a half old because I only put 20-30ish hours a year or so and didn't change it last fall. My boat is also stored in a garage not sure if that matters but I wouldn't change the oil if you just did it in the fall. Most car applications say change every X miles or 1 year so having oil sit for a few months is not going to be bad.
I actually have heard its best to change it in the fall right before you let it sit for several months so your engine is sitting with contaminates in the oil.
edited April 2018
it seems to me that you are just looking for an excuse to work on your boat since the weather has been so bad and you aren't actually using it.
I change mine in the fall.
Acids and byproducts of combustion accumulate in your oil and will eat away at metal parts, soft metal bearings etc. This includes your bottom end or transmission. If the bottom end on your out board has a bad seal, water could get in and rust the bearings and possibly freeze, expand and split open your gear case. All this allows the parts to sit in nice, fresh oil over the long winter. If you need to replace a seal or anything else, you have all winter to do it. When spring comes, BOOM, hit the water! All the work is done.
Are you asking whether to change oil that's never been run just because it's been sitting? No, not necessary. No difference between storing new oil in a bottle or in your engine.
As for when to change it, change it in the fall. As others have mentioned, get the contaminants and moisture out of it before it sits all winter.
Mike van Meeteren
★★★Triple Panda Award Recipient ★★★
If you're looking for some work to do, change your impeller:)
No, should be changed as part of winterization in the fall regardless of the hours on the current oil change. The clean fresh oil is good to go in the springtime, no need to change again.
That's what I figured. I always change it in the fall.
I like your comment that it sits in a bottle anyway. Funny.
You are correct sir!
Change in the fall and then every 50 hours after the start of the season.
Think it depends on your layup. For instance is your winterization in August and do you launch your boat in June. If so your new oil is quite old and you should sell your boat as it is a victim of neglect.
I'm from Ohio too and it's very dry in the winter, so it's a non issue. So i would leave it - it gets a little moisture when running anyhow.
MM Trick Skier / Eccentric Person
If the oil is black, change it. If that happens in spring, so be it. Changing oil before you need to wastes valuable resources.
Impellers, frozen blocks, corroded oil pans, wrong timing, diesel instead of gasoline (or gas years old enough to diesel), water lines that get disconnected (check after mussel decontamination) or some external failure will cause premature engine failure. As long as there is oil, that won't be your problem.
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