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Old 09-06-2020, 06:57   #61
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Re: Yanmar 3GM30 running well but using a lot of oil.

If you think it’s glazing, I have seen quite a bit of success from running them hard and running a detergent additive in the oil along with a high detergent oil of course, usually most higher grades of oil are high detergent. Sea Foam or ATF, ATF is good but not really aggressive like Sea Foam apparently is.
Worst case is you clean out your oil system is all.
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Old 09-06-2020, 10:45   #62
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Re: Yanmar 3GM30 running well but using a lot of oil.

You can try this oil to reduce consumption. It has the CD rating if you are fixated on that & it has the benefit of being both less viscous than straight 40 when cold & more viscous when hot. It's made for engines with excessive clearances.
https://penriteoil.com.au/products/c...25w-70-mineral

Good that your consumption seems to be getting less with the hard runs.If consumption remains too high I'd try the valve stem seals next as that is the easiest possible cause although my suspicion is oil control rings.
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