coolant for yanmar diesel? - SailNet Community
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post #1 of 7 Old 04-29-2012 Thread Starter
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coolant for yanmar diesel?

Being this is my first diesel engine I want to be sure. I need to add coolant. It's green coolant. Is that normal automotive coolant? I would imagine yes. My buddy who has a yanmar diesel brought some pink coolant and said his uses that. Can I mix green and pink? I know with my BMW I can't mix green and blue. It's one it the other. Thx!

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post #2 of 7 Old 04-30-2012 Thread Starter
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coolant for yanmar diesel?

Found the info. Pink and green don't mix and yanmar has stated the green coolant can break down the cylinder walls. Red coolant is what's supposed to be used.

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post #3 of 7 Old 04-30-2012
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Re: coolant for yanmar diesel?

Ever since a mechanic showed me some gelatinized coolant from a motor that had mixed coolant types, I've been paranoid. I don't know which combo will do that, which makes me more paranoid.

Drain it and start from scratch. Coolant should be replaced periodically anyway. Manuals usually say annually.


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post #4 of 7 Old 04-30-2012
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Re: coolant for yanmar diesel?

My 2GM20F came with green in it. Don't know how long it was like that. When I finally got around to replacing, I drained what was in there and used Prestone Extended Life, which is green. If this is bad, then I guess it has been bad for a while.

Still I think this isn't just a matter of antifreeze color--even the pinks aren't all the same. Wouldn't mind hearing the definitive word on this.

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Re: coolant for yanmar diesel?

So no Yanmar mechanic or other expert is going to weigh in on this?

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post #6 of 7 Old 05-07-2012
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Re: coolant for yanmar diesel?

I can tell you after speaking to a Yanmar mechanic and reading the manuals, anything other than what Yanmar specifically recommends voids the warranty.

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Re: coolant for yanmar diesel?

I'm not too worried about the warranty on my 25-yr-old engine. And I wonder if the recommendations in my 25-yr-old manual might have changed just because of changes in the products/technology out there. Does Yanmar publish current recommendations for older engines?
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