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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 09-21-2009
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Type of oil used for diesel engine

The owners manual for my Yanmar 2ym15 engine says to use 10w30 oil. Can I use standard automotive oil, or do I need a special oil for diesel/marine applications?
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Old 09-21-2009
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Use a C rated oil not an S rated. C rated oils are for diesel S are for gas.
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Quote:
Originally Posted by Maine Sail View Post
Use a C rated oil not an S rated. C rated oils are for diesel S are for gas.
Thanks for the info. Where can I get C rated oil, and what brand do you recommend?
Matt
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Wal*Mart sells both DElO 400 and Rotella T though mostly in 15W-40 which is the oil most used in diesels..
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MS - I'd be interested in your thoughts on the Synthetic oils and boat diesels.
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Faster- I hope MS or someone else gives some info. on the synthetics also. My experience with diesels is that unless you start using the syn's from when the engine is new it can develop a lot of leaks past crank seals etc. We put synthetic in a John Deere that had a lot of hours (several thousand) and it leaked out everywhere. We put Rotella back in and no leaks. We had another engine do the same, but it was a gas engine.
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Thanks John.. I'd heard something along that line before, and have had others tell me that the synths are great and worth the extra cost. However I've been reluctant to make the switch without more info..
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"Traditional" boat diesels that are naturally aspirated, do not like synthetic oils - Quite often they are designed to use grade CD which is so old that it can be hard to find.
If you use "better" oils than CC/CD, bore glazing and oil bruning may be the result.
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Look on the back of the container. There'll be a circle with the grade in the middle and the service designation around the top:



Anything with a Cx listed is rated for diesel engines. Each time they revise the service designation they increment "x". CD was introduced in 1955, and has been superseded by CE, CF, CG, CH, CI and now CJ. Each oil in the sequence is an approved replacement for those before it.

If you can't find 10W30 easily with a Cx designation, look for a straight 30 weight. The 10W part means it's a winter rated multigrade oil. Since you're probably not going to be using your boat in freezing temperatures, the cold weather properties of a 10W30 aren't needed.

Tim
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My Motor is only a couple years old. I'm not sure if synthetic oil was used in the past. Is it too old to switch to synthetic if standard oil was used in the past?
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