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View Poll Results: What kind of motor oil do you use?
30W 104 50.98%
10W-30 59 28.92%
10W-40 30 14.71%
Detergent 47 23.04%
Non-Detergent 4 1.96%
Natural (as opposed to synthetic) 48 23.53%
Synthetic 9 4.41%
Motorcycle Oil 4 1.96%
SG Grade 6 2.94%
Some Other Variation 12 5.88%
Multiple Choice Poll. Voters: 204. You may not vote on this poll

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  #101   IP: 137.103.82.227
Old 03-15-2020, 01:22 PM
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Quote:
Originally Posted by ronstory View Post
Joe--

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:

https://www.napaonline.com/en/p/BK_7...oaApyvEALw_wcB

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: 134.134.139.74
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.
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  #103   IP: 134.41.84.112
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.

EDIT: The engine developed a head gasket leak (air only) under the T-stat area where the head was weakened from years of salt water running through it. When the gasket was changed I couldn't get to torque two studs and found a small crack near the exhaust ports between two stud holes...again, worn thin from years of salt water. I changed the engine out and put in my spare. The internals are all still good on that and I've been told the right guy with a brazing rod can fix that issue. The issue it experienced had nothing to do with the oil I use. 15W40 is in the new one I put in as well.
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Last edited by Mo; 04-22-2021 at 04:57 PM.
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