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#2899943 - 02/08/13 07:51 PM Pentastar 3.6 oil pressure
The_Captain Offline


Registered: 08/06/12
Posts: 202
Loc: Upstate S.C.
I wanted to know if any forum members had any insight on Pentastar oil pressure issues. I have a 2012 Jeep Cherokee 4X4 with 3900 miles. Now to the issue. My oil pressure runs between 68 to 80 psi until the oil temp hits approx 158 degrees. It takes several miles for the temp to reach that with the factory oil cooler.Once the oil hits the right temp the pressure drops to around 30 psi.Anybody have any thoughts, theories ,similar experiences or info on this engine? Thanks
P.S. The oil temps never goes above 179/180 degrees


Edited by The_Captain (02/08/13 07:59 PM)
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#2899950 - 02/08/13 08:09 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
coolbird101 Offline


Registered: 11/22/12
Posts: 353
Loc: South Florida
Our pentastar equipped vehicle did the same, I beleive the oil pump is 2 speed, runs on high until temp comes up and than anything over 3k rpm (not sure about exact rpm) the pump runs on high.
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#2899974 - 02/08/13 08:34 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Dakota1820 Offline
formerly chevyboy14


Registered: 04/28/11
Posts: 3894
Loc: missouri usa
Couldn't it be because the oil is thicker and the engine is a tight tolerance engine which equals more pressure
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#2899977 - 02/08/13 08:36 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
RiceCake Offline


Registered: 09/22/12
Posts: 1044
Loc: Coldtown, Canada
Tolerance =/= clearance.

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#2899997 - 02/08/13 08:54 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
coolbird101 Offline


Registered: 11/22/12
Posts: 353
Loc: South Florida
For me it would be an abrupt drop, not gradual like oil thinning.
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#2900005 - 02/08/13 09:02 PM Re: Pentastar 3.6 oil pressure [Re: coolbird101]
The_Captain Offline


Registered: 08/06/12
Posts: 202
Loc: Upstate S.C.
Same for me. It is almost instantaneous. 70 psi down to 30 psi in a few seconds.
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#2900009 - 02/08/13 09:05 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
BillyTheKid Offline


Registered: 10/12/11
Posts: 451
Loc: ny
My jeep runs about the same oil pressure.

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#2900032 - 02/08/13 09:45 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Gabe Offline


Registered: 02/22/11
Posts: 1437
Loc: Indiana
I thought that the Pentastar has some goofy electric oil pump set up.

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#2900062 - 02/08/13 10:31 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Billy_D Offline


Registered: 06/23/08
Posts: 1005
Loc: midwest
Quote:
A chain-driven, vane-type variable displacement oil pump adjusts the flow rate and pressure as commanded by the engine management system, which uses a solenoid to drive the pump into low or high pressure mode. For example, below 3,500 rpm, the pump conserves energy by using low pressure; at speeds over 3,500 rpm, the pump switches to high pressure.

A force balance mechanism inside the oil pump adjusts the size of the pumping chambers to alter oil flow. If the oil is cold, the pump reduces the size of the internal chambers. When the oil is hot and thinner, more oil is needed, and a spring increases the size of the pump chambers. This also saves energy.

The pump is driven at a 1:1 drive ratio; its location under the block is more efficient than an on-crankshaft location. An internal, mechanical ball-and-spring relief valve dumps oil into the sump when needed, for conditions such as a cold start with high engine speed. Both pump and pressure regulation solenoid are non-serviceable.


Source Pentastar.com

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#2900073 - 02/08/13 10:55 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
chubbs1 Offline


Registered: 06/09/10
Posts: 4574
Loc: Merritt Island FL, USA
I have 2 2012 Charger SXT's with the 3.6 Pentastar. I have been very happy with them. The oil pressure (OP) is very much like yours, when the temp of the oil reaches approx 174F the pressure goes from the 70-80PSI range to 35-41PSI range. The hottest my oil has gotten is 214F in stop and go traffic mid summer. The Lowest the pressure has gotten is 25PSI at idle in drive. I do find it "funny" that at exactly 174F the pressure drops but pressure is higher with thicker oils and thinner oils cause lower readings.
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#2900090 - 02/08/13 11:24 PM Re: Pentastar 3.6 oil pressure [Re: chubbs1]
crazyoildude Offline


Registered: 07/23/08
Posts: 9808
Loc: New Jersey
i have heard of problems with those engines but have never seen any at my engine shop. A lot of new engines have ticks and knocking sounding noises that do not do any damage. Some have loud vvt some have other noises but a lot of the new engines seem to be a lot louder than the older ones.
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#2900182 - 02/09/13 06:58 AM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
I had a rental Chrysler 300 a few months ago and the oil pressure behavior was the same as you are observing. It's 75-90 psi for a while, then BAM, it drops to 25-40 psi and stays there, unless you hit 3,500 rpm, then BAM, it's back up to 75-90 psi. Odd, and you can feel it in the engine if you are feeling for it. The note of the engine changes just ever so slightly when the oil pressure spikes at 3,500 rpm.

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#2900186 - 02/09/13 07:04 AM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18322
Loc: Sunny Florida
The new vane pumps are very different from the gerotor style we are used to in most cars.

Add in the variable displacement feature and you have a bizarre readout to study for the "new normal".

many newer engines are now using this style oil pump. Since all the variable cam timing and cylinder deactivation strategies are operated hydraulically by oil pressure the new engines require a larger volume of oil flow.
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#2900511 - 02/09/13 01:35 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
cptbarkey Offline


Registered: 02/27/12
Posts: 3007
Loc: texas
electric oil pumps... dont quite like the sound of that at all.

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#2900605 - 02/09/13 03:05 PM Re: Pentastar 3.6 oil pressure [Re: cptbarkey]
caravanmike Offline


Registered: 05/09/09
Posts: 1060
Loc: ohio
Originally Posted By: cptbarkey
electric oil pumps... dont quite like the sound of that at all.

everything i read says it is chain driven! the elec part controls high or low pressure. from what i understand the motor can survive just fine on low pressure.

"A chain-driven, vane-type variable displacement oil pump adjusts the flow rate and pressure as commanded by the engine management system, which uses a solenoid to drive the pump into low or high pressure mode. For example, below 3,500 rpm, the pump conserves energy by using low pressure; at speeds over 3,500 rpm, the pump switches to high pressure."
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