Oil Pressure

[Alex A Madrigal]

Hey Everyone. I recently purchase a 2014 Chevrolet Silverado Double Cab 5.3 V8 4wd. One owner, almost 30k miles on it. When im cruising my Oil Pressure is around 40 PSI. when i stop or press the breaks my oil pressure drops to around (25-35) PSI. When i turn my truck on the mornings. its around 40 PSI but then it drops to (25-35). is this normal. i check the oil and it seems fine. i dont hear any noises on the motor. Any help would be appreciated or feedback.

[LongrangeLauber]

Mine has been like that since day one. Maybe due to the lower viscosity oil?

[muddkatt]

I think these engines have a 2 stage oil pump. BTW, mine does the same thing.

[glcbn]

From what I've read, the oil pump on these new engines is variable. What you posted seems to be the norm at low rpm. If you accelerate hard the pressure should climb well passed 40 psi.

[newdude]

Normal.

 

The 4.3L (L83), 5.3L (L86), 6.2L (LV3) engines are equipped with a two stage oil pump.

 

The oil pressure gauge jumping three times is caused by a test routine the engine goes through during the first few minutes of driving to insure that both stages are operable.

 

The oil pressure gauge going to 60 lb. over 3700 RPM, is the calibrated engine speed the oil pump goes into the high pressure stage.

No repairs should be attempted.

 

This is normal operation for these engines.

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

[amxguy1970]

Yup, same with pretty much every vehicle ever made with an engine. Lets think this through. Oil needs pressure to move it around the engine, the more RPM it turns the more the oil that needs to be moved, hence the pressure increases to move it to other areas faster. So yes, that is normal with any car ever (I can't think of a scenario off the top of my head that it would not happen that way).

 

Tyler

[LongrangeLauber]

I'm assuming the OP was curious why the oil pressure drops? That's why I said the lighter viscosity oil contributed to the lower oil pressure. I know my 02 Silverado had a cruising oil pressure of 60 PSI

[Jeff5347]

What I usually went by was 10 lbs/ 1000rpm. An average 350 with good pressure, seals, and such is good w an OP at 30 psi at idle. Pressure will be dictated by viscosity, ambient temp and engine speed. From my understanding, since I haven't really gotten into the 5.3 , is once the engine starts seeing high revs..it will rise to roughly 60 psi. In my old 350 psi would sit at 25 psi at idle and 40-50 at speed. When it was hot outside this would decrease. Due to less than stellar block machining after less than 10000 miles I needed 20/50 as my psi would drop to ~10 psi at idle. That was super scary and frustrating. These new engines are built to much better specs than years ago. The oil pump is just that.. A pump...spin it slow it will circulate the fluid slow....as the pump ramps up so will circulation and fluid pressure. My last vehicle was an 03 maxima and I would play with viscosities. Now I run what they say...I have a 100k warranty and don't want that voided due to not using their recommended oil weight. So to answer your question...mine does exactly what yours does

 

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[redwngr]

Yup, same with pretty much every vehicle ever made with an engine. Lets think this through. Oil needs pressure to move it around the engine, the more RPM it turns the more the oil that needs to be moved, hence the pressure increases to move it to other areas faster. So yes, that is normal with any car ever (I can't think of a scenario off the top of my head that it would not happen that way).

 

Tyler

 

These engines have more than the usual variation with rpm. They have a 2 stage function operated by the ECM.

 

From the techlink article:

 

"Advanced Oiling System

The oiling system incorporates a new variable displacement two-stage vane-type oil pump that enables more efficient oil delivery, based on the engine’s operating conditions. Its dual-pressure control enables operation at a very efficient oil pressure at lower rpm, and then delivers higher pressure at higher engine speeds.

An oil control solenoid valve, controlled by the Engine Control Module (ECM), mounted to the oil pump provides two-stage functionality. The oil pump is mounted on the front of the engine block and driven directly by the crankshaft sprocket. The pump rotor and vanes rotate and draw oil from the oil pan sump through a pick-up screen and pipe. The oil is pressurized as it passes through the pump and is sent through the engine block lower oil gallery.

Pressurized oil is directed through the engine block lower oil gallery to the full-flow oil filter and then to the upper main oil galleries and the valve lifter oil manifold assembly.

An oil passage at camshaft bearing location permits oil flow into the center of the camshaft. Oil enters the camshaft, exiting at the front and into the camshaft position (CMP) actuator solenoid valve. The CMP valve spool position is controlled by the ECM and CMP magnet. When commanded by the ECM, the CMP magnet repositions the CMP actuator solenoid valve spool directing pressurized oil into the CMP actuator to control valve timing.

dexos 1™ Engine Oil

TIP: Failure to use the recommended engine oil and correct viscosity or its equivalent can result in engine damage not covered by the vehicle warranty.

The dexos1 specification was uniquely designed to complement the exacting requirements of GM’s advanced engine technology. The specification has gone through an extensive developmental and testing process. Only those oils displaying the dexos1 trademark and a registered trademark logo on the front label of the container meet the demanding performance requirements and stringent quality standards set forth in the dexos1 specification.

SAE 5W-30 is the required viscosity grade for the 4.3L engine.

SAE 0W-20 is the required viscosity grade for the 5.3L and 6.2L engines.

DO NOT use other viscosity grade oils such as SAE 10W-30, 10W-40, or 20W-50."

Link to article:

http://sandyblogs.com/techlink/?p=2139