Is an Oil Change Required ? - Page 2 - SailNet Community
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post #11 of 17 Old 09-20-2016
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Re: Is an Oil Change Required ?

I have been advised by mechanics, etc. to move the boat around under power for a while to heat up the oil just before I haul the boat in the fall, then change the oil & filter with boat still on the water while oil is still hot to make it easier to pump out. Once on land I flush raw water side with fresh water (so have to run the engine again, but now with new oil), the boat sits on land for 5-6 months without running engine, then in spring I run engine again before launch. Is that procedure wrong? Do I really need to change it again in spring and run engine during winter?
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post #12 of 17 Old 09-20-2016
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Re: Is an Oil Change Required ?

Last thing an engine needs is to sit all winter with acidy oil in the bearings. So a change at haul out??? Unless there is a lot of condensation which will show after a bit of running in the spring and blow off when hot anyway I'd say good to go until hrs are up or winter catches up again .Plugging the exhaust outlet will prevent engine breathing wet air as the barometer rise/fall daily and draining the aqua lift muffler will help too
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Re: Is an Oil Change Required ?

Remember that the OP has less than 1 hour on the oil. Where did we get the idea it was acidic? At most it has some condensation, but I doubt even that. He didn't run it enough.

(30 years in the lube oil business as a chemical engineer)

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Re: Is an Oil Change Required ?

I highly recommend a change in lifestyle.

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Re: Is an Oil Change Required ?

On a side note, can you use synthetic in a diesel?

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Re: Is an Oil Change Required ?

Quote:
Originally Posted by pdqaltair View Post
Remember that the OP has less than 1 hour on the oil. Where did we get the idea it was acidic? At most it has some condensation, but I doubt even that. He didn't run it enough.

(30 years in the lube oil business as a chemical engineer)
What about residual oil that gets mixed in during the change? Do the additives from the new oil counteract this perpetually?

On diesels, more than gas engines, I find the oil almost instantly starts going off color, even with a filter change. Always figured it was due to higher contaminants in passageways and the pan from the residual oil.

I now get in the habit of running an engine wash, like Amsoil engine flush, in the Spring when I'm putting new oil in for the season. Seems to make a big difference (at first). What's your take?


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post #17 of 17 Old 09-21-2016
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Re: Is an Oil Change Required ?

Quote:
Originally Posted by cshrimpt View Post
On a side note, can you use synthetic in a diesel?

Shrimp
I found a page (which i can't remember were) that talked about using synthetics on older diesels.

Long story short, this guy had a diesel that ran like a top, never burned oil. They put synthetic in it and did a 30 hour transit under power. Bores were mirror polished in the pictures and the diesel burned oil like crazy. I think the motor may of been a Yanmar and when they contacted the company they said it was the oil.

I love synthetic for my car. For my boat, i put in what Volvo says to put in even if it is a extra $10 bucks for their fancy oil.

If i can find that page ill post it. It was a interesting read.

Found it*http://coxengineering.sharepoint.com...htengines.aspx

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Last edited by 2ndimpression; 09-21-2016 at 11:11 PM.
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