Engine oil recommended and oil pressure

[ctcruiser]

Just need to clarify the weight of the oil and the oil pressure reading that is preferred. As of now the oil i am using is 20W50 and my oil pressure reading is at 90, i have a slight squealing sound but goes away and then comes back, my oil pressure is reading at 90 while the engine is revved up and drops slightly below at idle around 650 rpm.
Any ideas for the oil weight and type to use and what should my oil pressure should be reading at.

[Esteban]

I use 5W30. Whit the engine hot, mine is around 52 psi at 2000 rpm. At idle it drops to 30 psi. But afer driving unstop for about 1 hour on the highway, at idle it drops to 15 psi. My crankshaft is untouched and with probably 200k miles, and new bearings with 18k miles.

I think your pressure meter could be off. I have never attained more than 72 psi: that on another Patrol with a brand new crankshaft, new original bearings, and a new oil pump tweaked with an addiitional washer to increase the max pressure.

I have tried a number of oil weights includding synthetic, and always similar readings.

I have not the manual at hand to post factory oil pressure data.

[ctcruiser]

I use 5W30. Whit the engine hot, mine is around 52 psi at 2000 rpm. At idle it drops to 30 psi. But afer driving unstop for about 1 hour on the highway, at idle it drops to 15 psi. My crankshaft is untouched and with probably 200k miles, and new bearings with 18k miles.

I think your pressure meter could be off. I have never attained more than 72 psi: that on another Patrol with a brand new crankshaft, new original bearings, and a new oil pump tweaked with an addiitional washer to increase the max pressure.

I have tried a number of oil weights includding synthetic, and always similar readings.

I have not the manual at hand to post factory oil pressure data.

how about oil additives?

[Esteban]

I don't put any additives on mine, but I guess that's a personal choice.

I was reviewing the data on oil pressure, and have the following:

Oil pressure running: 50 - 57 psi [3.5 - 4 kg/cm2]

Oil pressure idling: 7 psi with oil temp at 160 - 176°F [ 0.5kg/cm2 at 70 - 80°C]

[moore_rb]

Just personal opinion here- but 20w-50 is too heavy for a Patrol engine.

research has shown thinner motor oils that flow easier actually prevent engine wear better than heavier motor oils. lighter weight oils get in there and flush all the contaminants and small particles out more quickly, and since the oil flows and mixes easier, it delivers these particles to the filter faster, before they can cause excessive wear.

up in New England, 10W-40 is the heaviest I would consider running, and probably 10w-30 (summer) and 5w-30 (winter) would be even better.

regarding the squealing sound, got any video or sound clips of it?

Noises are the WORST thing to try and troubleshoot on the Internet, but that doesn't stop idiots like me from trying anyway...

[Esteban]

Forgot about the squealing sound, one typically happening in a Patrol is caused by the pilot bearing in the crankshaft for the input shaft of the transmission. However, this one only produces sound the moment you are actuating the clutch. What happens is that the bronze bearing is turning inside the crankshaft, because it's binding to the input shaft. Nothing to worry about, and if it's that, next time you drop the transmission will be a good time to address it.

[ctcruiser]

thank you very much for the advice, changing oil this weekend

[Pancho]

I am using 20w50 in my Patrol. Just a month ago I realize that when the engine is cold, lets say after the night, it takes like 5 seconds for the pressure needle to start going up? Should I use a lighter oil? Or do I have a major issue with my bearings and crankshaft? Maybe the oil pump? Exterior temperature is about 54F and the engine runs fine every time.

[Esteban]

I am using 20w50 in my Patrol. Just a month ago I realize that when the engine is cold, lets say after the night, it takes like 5 seconds for the pressure needle to start going up? Should I use a lighter oil? Or do I have a major issue with my bearings and crankshaft? Maybe the oil pump? Exterior temperature is about 54F and the engine runs fine every time.

What I'm thinking is that the oil drains or the filter overnight. For others that might not be aware, you have the filter adapter that you developed that allows a spin-on filter to be installed. Maybe the filter that you have right now drains more easily than the others. Spin-on filters supposedly keep the oil inside, but the rubber membrane at the bottom that acts as a check valve, might be allowing a little bit of oil to drain, and overnight all will be gone.

The original filter has a funnel type piece in the center, that allows the oil to remain inside the filter so the pump doesn't have to fill the filter every time until it builds up pressure.

I think it's normal in your case to have a slight delay.

[Pancho]

I was thinking the same and decided to changed Fram filter for a Baldwing but nothing happened. The flow converter should not be the problem because it is large enough to allow free flow with almost no retriction. I'm thinking maybe the clearence in the bearings is too much and it allows oil to leak overnight.