Oil pressure

[ReekingHavoc]

I recently had an oil change 5w-20 and filter changed on my 2019 Ram 1500 5.7L. When I start the truck it displays 0 psi for then jumps to around 55-60 psi within seconds. Drove around the block about a mile and a half turned off the truck and the psi drops to 0. I’m monitoring this through the dash setting that show oil temp and psi. Temp I believe is around 120ish.

I’m wondering if this is normal? I’m not sure if the truck had 5w-30 in it previously as the sticker on the window indicates but I went with what was on the oil cap on the engine.

Truck is not making any noise or displaying and lights on the dash.
Oil level looks good on the dip stick.

Thanks for any advise, I don’t want to jack anything up in this truck.

 

[Daniel Ortiz]

@ReekingHavoc , the engine has to turn to make the oil pump work, and it takes a second or two for the oil pump to develop the pressure up to the full amount at start-up (mid to high 50s, as you said). That's why most engine wear comes from cold start-ups, before the oil has had a chance to work its way up with meaningful pressure. During those 1 to 2 seconds it takes, the moving parts rely on residual oil film from the last shut-down. That's another reason it's not good to let a car sit too long without turning it on and warming it up. This is normal, if unfortunate. An electric primer motor would be an interesting invention, but probably overly-complicated, and perhaps un-necessary.

Now, if it takes TOO long to develop the pressure and you start hearing the clacking of lifters on the camshaft, that is less than ideal, but does occasionally occur to some of us (me included occasionally). But if you don't hear any lifters clacking at start up, and only see your pressure shoot up from zero, that is normal, and what happens in my truck as well.

 

[danielmid]

Synthetic Oil

Control system, royal purple, or valvoline synpower? Which would you or do you use? Also is the oil change message triggered by a specific mileage engine hour or what? Sent from my LT26w using Tapatalk 2

www.ramforum.com

Oil Filter Thread

So member adrianp89 brought this test to the Syn thread, but this test is good enough to have it's own thread and many guys have tuned out of the Syn thread. This test proves the benefit from spun micro glass filters, all of the top three performers where spun microglass, and others such as Wix...

www.ramforum.com

Likely filter related draindown, and 5w-30 performs better in the Hemis than the 5w-20 usually.

 

[turkeybird56]

YUP, sounds like drain down, from filter, why U see recommended on Oil/Filter thread at a Minimum purchase good quality filter. A lot of us run a RP Filter or 100% Synthetic Fram Filter, or something similar with good pressure drain back valves. I run 5W20, but my truck is a driveway princess. If run a lot, would run 5W30. And I run full synthetic with a full synthetic filter. Another train of thought is to rev engine a few times before U shut down. Not sure on that one. But on my 2019 DT, rarely get cold start/clatter especially since I went from OEM to Fram. Now this is all IMHO... OP (original poster), Check out the Oil and Oil Filter thread by Burla and make an informed decision.

 

[DILLIGAF]

Previous owner was a smart men if he was using 5w30

 

[ReekingHavoc]

YUP, sounds like drain down, from filter, why U see recommended on Oil/Filter thread at a Minimum purchase good quality filter. A lot of us run a RP Filter or 100% Synthetic Fram Filter, or something similar with good pressure drain back valves. I run 5W20, but my truck is a driveway princess. If run a lot, would run 5W30. And I run full synthetic with a full synthetic filter. Another train of thought is to rev engine a few times before U shut down. Not sure on that one. But on my 2019 DT, rarely get cold start/clatter especially since I went from OEM to Fram. Now this is all IMHO... OP (original poster), Check out the Oil and Oil Filter thread by Burla and make an informed decision.

Right now it I’m using a mopar mp-330 filter, I’m definitely checking out that filter thread. Thank you.

 

[ReekingHavoc]

Previous owner was a smart men if he was using 5w30

I might have to switch it back.

 

[ReekingHavoc]

@ReekingHavoc , the engine has to turn to make the oil pump work, and it takes a second or two for the oil pump to develop the pressure up to the full amount at start-up (mid to high 50s, as you said). That's why most engine wear comes from cold start-ups, before the oil has had a chance to work its way up with meaningful pressure. During those 1 to 2 seconds it takes, the moving parts rely on residual oil film from the last shut-down. That's another reason it's not good to let a car sit too long without turning it on and warming it up. This is normal, if unfortunate. An electric primer motor would be an interesting invention, but probably overly-complicated, and perhaps un-necessary.

Now, if it takes TOO long to develop the pressure and you start hearing the clacking of lifters on the camshaft, that is less than ideal, but does occasionally occur to some of us (me included occasionally). But if you don't hear any lifters clacking at start up, and only see your pressure shoot up from zero, that is normal, and what happens in my truck as well.

That makes sense, it only take about 1-2 seconds to get up to mid 50 psi but I don’t remember it dropping the pressure to 0 after the truck was turned off before the oil change.

 

[JHoward]

I might have to switch it back.

I would. And while your at it get rid of that MO-339 and use an Royal Purple 20-820 or something equivalent.

 

[JHoward]

That makes sense, it only take about 1-2 seconds to get up to mid 50 psi but I don’t remember it dropping the pressure to 0 after the truck was turned off before the oil change.

If the engine isn't running, there isn't any oil psi ....