I would appreciate your feedback on what was your oil pressure readings were after replacing the oil pump?

This is my reading at 185 degree Fahrenheit fully warmed up engine.
- 18 lbs at idle
- 50 lbs at 2000 RPM.

Thanks...

 

Idle pressure is a little low, but not fatal. Normally a bit higher like mid 20s to low 30s but 18 is conceivable. What oil are you running? 15w40 might increase it 2-3 lbs if you are on 10w30. 50lbs is the relief valve pressure, so you are good on the at revs.

 

I am running 10w40, since I drive my truck to snow country during the winter, however I think that I will consider the change on my next oil change to see if it makes any difference. Are you running the shell diesel?

 

I usually run the dino oil, whatever is cheapest at the time and I change it every 5k. My discos are mostly used on short trips and my oil analysis results always come back low viscosity due to fuel dilution and recommended change, so the long life synthetics are a waste of money for me. If you drive long trips mostly it might be worth it, but not with my driving.

 

I have always been a believer of changing oil sooner than later since fuel dilution is more common with older high mileage engines and it is cheap insurance. Appreciate your inputs.

 

I have to drive at least 20 minutes before engine is fully warmed up. Coolant temp gets to nominal quickly but oil temp lags a lot. Oil pressure depends on oil viscosity and this depends on oil temperature again. Comparing oil pressure values without exact oil temperature is just throwing random numbers around.

 

Here are some real world values I measured after a cold start (outside about 55F):
coolant temp / oil temp / oil pressure at idle
140F / 104F / 43 psi (coolant gauge on the cluster says "nominal")
188F / 150F / 25 psi
188F / 170F / 16 psi
188F / 185F / 14 psi
It took me 10 minutes of driving (city) to get the oil temp to 185F. Bottom line, the oil pressures varies with oil temp, even if the coolant temp has been stable.

Edit: I use 10W40.

 

That's great info. This should help many with a reference point. Thanks.

 

18psi at idle is not low.... here are the correct specs

Pressure at Idle - Minimum .................... 0.7 bar (10 psi)
Pressure at 2000 RPM .................... 3.4 bar (50 psi)
Relief Valve Opening Pressure .................... 3.4 bar (50 psi)

18pis is way more than healthy.

Remember, high pressure is not necessarily good. Just like a motor running too cold is not good either. We need to take a breath and follow what the manufacturer built it to do, not what we think it should be...