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View Poll Results: What kind of motor oil do you use?
30W 102 51.00%
10W-30 58 29.00%
10W-40 30 15.00%
Detergent 47 23.50%
Non-Detergent 4 2.00%
Natural (as opposed to synthetic) 47 23.50%
Synthetic 8 4.00%
Motorcycle Oil 4 2.00%
SG Grade 6 3.00%
Some Other Variation 12 6.00%
Multiple Choice Poll. Voters: 200. You may not vote on this poll

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  #101   IP:
Old 03-15-2020, 01:22 PM
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Originally Posted by ronstory View Post

I wish had your oil pressure, then I would only be dealing with a bit of blow-by. I manage that by having vent cap with a hose connection that I put in the bilge blower inlet. Looks similar to:

I have 80PSI cold when warm up the engine and drop to 40-45 in 5 mins. When running for more than hour at cruise I'm at 20 PSI. At idle when I'm maneuvering into the slip, I'm at so low on oil pressure that I'm worried about the OPSS killing the engine.

Now back to the question: Has anyone else done the larger 1/4" NPT Street ell into the oil pump?
Bearing clearances? Have you measured the oil temperature? You might putt off a rebuild with an oil cooler and maybe thicker oil.
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  #102   IP:
Old 03-15-2020, 03:27 PM
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Could be bearings clearance or it could be the oil pump. Ken's thoughts were that pumps do go wear out.

I already installed an indigo remote oil filter plus their oil cooler in an attempt to stave off the rebuild. I'm also using the Indigo thermostat, so I have nice toasty and consistent 180F water temp with their electric FWC.

So I'm heading down the rebuild path on the spare motor... and trying learn as much as possible about 'best practices' from the forum. I have all the MMI tech tips archived, but looking for do's & don't from our very knowledgeable members.

... and I will make positive to install all three internal oil plugs.
Portland, OR
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  #103   IP:
Old 06-06-2020, 10:36 PM
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Been using 15W40 Diesel oil for 13 years now. Have not had one mechanical issue with the engine...3 black iron hot exhausts later, a fuel pump, bunch of filters, generally maintenance and a raw water pump. I've changed the oil at 25 hrs and to be honest it's hard to see where it is on the dipstick it's so clean...been clear for years now. Been a good engine. Still a great running engine.

1976 C&C 30 MKI

The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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