Oil Pressure Readings

[AXE]

Since we are now switching to 0W40 oil per the GM 6.2L recall, I decided to benchmark my oil pressure using a digital guage from the Torque Pro app using OBD II Bluetooth dongle.

I understand this guage is just reporting the information the ECUnis receiving, so there is always a chance of discrepancy with the idiot guage in the DIC if they were not in sync for some reason.

For the most part, this Torque Pro guage would show oil pressure similar to the estimates I made looking at the idiot guage.

Anyway here's what I was seeing after a few minutes of warm up time at idle With the 0W20 Mobil 1 Dexos oil I have in my 1500 ZR2.

35-45+ psi at idle 600 rpm (higher at start up/lower after warm up)
45-60 psi at 1000-2500 rpm
60-65+ psi 2500-3500 rpm

I also seen some spikes up to 80 psi when I was revving or accelerating to get from 2000 rpm to 3500 rpms, but it would settle down quickly.

Anyway, this seems normal from my experience with GM motors, but I do not know the exact GM specs.

Also, no main crank or rod bearings were harmed during this test.......allegedly!

 

[AXE]

The Torque Pro app comes with a long list of SAE PIDs, but for some reason there is no oil pressure reading. I found this PID information posted on another forum. It seemed to work. You have to add a guage of your choice from their list and then assign the custom Oil Pressure PID information into the database.

 

[AXE]

I went out and did the same with my wife's Tahoe. Added the rpm guage below oil pressure for easier viewing. For the most part the readings were similar, but I noticed they were a tad higher in lower-mid rpms. This rig is also running Mobil 1 0W20 oil.

 

[AXE]

I did some more testing when I was running around today. Long story short, there does not seem to be any issues with oil pressure in my rig. It covers the range from mid-30s to mid 80s+ depending upon conditions.

A few more observations. When the motor warms up after 8-10 minutes of run time, the idle pressure in D is 30 ish+/- while stopped in D. When banging gears with the paddles oil pressure will be 80 +/- north of 4k rpms. Cruising freeway at 75 mph in D it'll be 52ish. I noticed a spike in oil pressure to 65-70 ish when in D right at the shift points while steady acceleration.

 

[Byrds8]

I did some more testing when I was running around today. Long story short, there does not seem to be any issues with oil pressure in my rig. It covers the range from mid-30s to mid 80s+ depending upon conditions.

A few more observations. When the motor warms up after 8-10 minutes of run time, the idle pressure in D is 30 ish+/- while stopped in D. When banging gears with the paddles oil pressure will be 80 +/- north of 4k rpms. Cruising freeway at 75 mph in D it'll be 52ish. I noticed a spike in oil pressure to 65-70 ish when in D right at the shift points while steady acceleration.

I may be sending this Autel back. It is not showing me live data. IT doesnt even show the tile to get to any of it. I put in a support ticket because maybe I'm just dumb. We will see what they say.

 

[laibal]

I may be sending this Autel back. It is not showing me live data. IT doesnt even show the tile to get to any of it. I put in a support ticket because maybe I'm just dumb. We will see what they say.

Ive got an MS906BT, I think the Pro replaced it. Its been a good full featured hobby scanner for me.

 

[AXE]

I may be sending this Autel back. It is not showing me live data. IT doesnt even show the tile to get to any of it. I put in a support ticket because maybe I'm just dumb. We will see what they say.

See if anyone has a YouTube video, maybe some features need to be turned on or maybe it needs a firmware update.

I've got three of those OBX Mx+ readers and newest one of them is not connecting to my phone without a lot of fiddling around. Might buy another one and return this one cause I haven't had it very long. Sometimes you just get a POS.

 

[Byrds8]

Autel Scanner MaxiCheck MX808S is the one I purchased off Amazon.​

Firmware and software was up to date.

 

[Byrds8]

So I played with it more this morning and finally found the live data. The two screenshots below are after it’s warmed up. One is in D and the other is at 1500 RPM sitting still. Not sure how much absolute vs gauge pressure matters or which is more important. They are both included.

 

[Byrds8]

Thinking about it, since my pressure is about what Axe’s is, I wonder if the vehicle knows to change what the pump is doing to keep at or around those levels. Mine may be slightly higher than with 0w20 but not significant. Either that or going up in the viscosity really doesn’t do much.

 

[AXE]

Thinking about it, since my pressure is about what Axe’s is, I wonder if the vehicle knows to change what the pump is doing to keep at or around those levels. Mine may be slightly higher than with 0w20 but not significant. Either that or going up in the viscosity really doesn’t do much.

I thing there's a pretty complicated formula in the software for oil pressure. I drove about 16 miles and watched it in many conditions and it seemed to be doing a good job adjusting to variable driving conditions. I know it was very responsive and almost instantaneous.

I'd have to switch over to 0W40 to be sure, but I feel like that isn't going to change pressure, but might help with heat management and sheer strength.

Does your code reader give you oil temperature?

 

[Byrds8]

I thing there's a pretty complicated formula in the software for oil pressure. I drove about 16 miles and watched it in many conditions and it seemed to be doing a good job adjusting to variable driving conditions. I know it was very responsive and almost instantaneous.

I just meant because my oil pressure vs yours wasn’t a huge difference with the different oils we are running.