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PENZOIL Platinum HM lower oil pressure #5158023
07/11/19 05:41 PM
07/11/19 05:41 PM
Joined: Dec 2018
Posts: 4
Mt
Rattler Offline OP
Rattler  Offline OP

Joined: Dec 2018
Posts: 4
Mt
Hi all. I have a 97 ram 1500 with a 3.9 magnum. It has 110,000 on the clock. I normally use Mobile 1 EP 5w30 but the price with rebate was too good to pass up on the Penzoil Platinum High Mileage 5w30.

I've only got 14 miles on the oil but have noticed significantly less pressure with the PP at idle. Anyone have an idea what is going on?

Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5158031
07/11/19 05:52 PM
07/11/19 05:52 PM
Joined: Apr 2010
Posts: 1,742
Suburban Washington DC
atikovi Offline
atikovi  Offline

Joined: Apr 2010
Posts: 1,742
Suburban Washington DC
The old filter was loaded with dirt causing a restriction and resulting in higher pressure. New filter, less restriction, lower pressure.

Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5158043
07/11/19 06:07 PM
07/11/19 06:07 PM
Joined: Jul 2008
Posts: 332
Bucks, PA
zfasts03 Offline
zfasts03  Offline

Joined: Jul 2008
Posts: 332
Bucks, PA
My 1997 Ram 1500 4x4, 5.9 also has lower oil pressure with some oils. I think Pennzoil is slightly lighter of an oil at operating temps.

As long as the oil pressure doesn't get below about 1/4 on the gauge at idle you should be good. Mine still comes to a little over 1/2 when cold and higher RPM's. Also it is hotter out so the oil is running hotter and thinner.

The oil pressure sender is after the filter, so I don't think a new filter would cause lower pressure. The way I understand your old restricted filter would cause lower pressure readings not a new filter.


- 03 Corvette Z06
Amsoil 5w-30 SS
- 07 Honda Accord 2.4L
Amsoil 5w-20 SS
- 16 Suburban 5.3L
Amsoil 0w-20 SS, XG10575(16-28 by-pass)
- 18 4Runner TRD Off Road
Amsoil 0w-30 SS, TRD filter
Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5158049
07/11/19 06:20 PM
07/11/19 06:20 PM
Joined: Dec 2018
Posts: 4
Mt
Rattler Offline OP
Rattler  Offline OP

Joined: Dec 2018
Posts: 4
Mt
Alright, thank you guys. I'm not going to worry about it then. Zfasts03 that's exactly how my dash pressure gauge is behaving. I'm glad I asked before chasing a problem that wasn't there with a new sending unit and high volume oil pump!

Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5158299
07/12/19 01:58 AM
07/12/19 01:58 AM
Joined: Jul 2017
Posts: 961
WA
OilUzer Offline
OilUzer  Offline

Joined: Jul 2017
Posts: 961
WA
When the light comes on something is wrong.

My oil pressure gauge has no marking on it ... No numbers, no color (red, good, bad, ok) ...
It's usually somewhere near the middle. It's a boring garage and I ignore it most of the time.
I think they wired the oil light to it. If the light is on, the gauge may go all the way up or down.
If light is off, stays in the middle.

Old cars or most new cars have no oil pressure gauge.
I prefer a digital readout. Analog gauges with no numbers or scale are meaningless!

Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5158317
07/12/19 03:45 AM
07/12/19 03:45 AM
Joined: May 2019
Posts: 758
WA
Mad_Hatter Offline
Mad_Hatter  Offline

Joined: May 2019
Posts: 758
WA
PP HiMi has a VI of 170 so it shouldn't be thinning that much at operating temp, if at all. (higher the # the less susceptible to the effects of high operating temperature?) And it has a 10.1kv @100c so it's a middle of the road Xw30, right?

Can you get a low oil pressure light with these numbers and it not be something else causing it??

Last edited by Mad_Hatter; 07/12/19 03:47 AM.
Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5158394
07/12/19 07:22 AM
07/12/19 07:22 AM
Joined: Oct 2017
Posts: 611
Northeastern Vermont
littleant Offline
littleant  Offline

Joined: Oct 2017
Posts: 611
Northeastern Vermont
2002 Jeep 4.0 162,000 miles Have the same results with Pennzoil Platinum High Mileage 5w30 and 10-30. About 20 psi at idle where as the same conventional oil presure is 30 psi at idle. But I will not worry about it because this winter at -30 to -40 with fram ultra filter the Pennzoil flows great far superior at cold temps then the conventional.


I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0
Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5159498
07/13/19 11:26 AM
07/13/19 11:26 AM
Joined: Dec 2018
Posts: 4
Mt
Rattler Offline OP
Rattler  Offline OP

Joined: Dec 2018
Posts: 4
Mt
My oil light isn't kicking on. The pressure gauge reads the 1/4 Mark at idle once warm at idle and 40 or a bit over while driving. Mobil 1 the needle barely moved.

Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5159514
07/13/19 11:54 AM
07/13/19 11:54 AM
Joined: Jul 2005
Posts: 32,486
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 32,486
NY
Originally Posted by Rattler
My oil light isn't kicking on. The pressure gauge reads the 1/4 Mark at idle once warm at idle and 40 or a bit over while driving. Mobil 1 the needle barely moved.

I would confirm actual oil pressure with a mechanical oil pressure gauge and eliminate any guess work. Dash oil pressure gauges are for the most part a glorified idiot light and don't tell much of anything in cases like this.


God Bless Our Troops

Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5159540
07/13/19 12:38 PM
07/13/19 12:38 PM
Joined: Dec 2004
Posts: 11,355
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline

Joined: Dec 2004
Posts: 11,355
1/2 hr N.E. of Detroit
I agree withe Demar. If you are changing oil brands ...aka... formulations - changing viscosities, your oil gauge will show changes also. Gauges also change with our four seasons here in Michigan.
Best way to judge a factory oil gauge reading is thru consistency. Keep things the same with your oils and document how differing, drastic weather changes your readings. Then compare year-to-year.
Most owner manuals sitting in your glovebox has several pages on the back for taking notes. Most have never written a thing on those pages.

Last edited by Triple_Se7en; 07/13/19 12:40 PM.

19 Hyundai SantaFe 2.4GDI Castrol Edge 5w30 / NAPA Mann-Hummel filter / 6oz Liqui-Moly Treatment
04 Colorado 3.5 Castrol Edge 0W40 Euro & K&N filter
03 Malibu 3.1 QS / Valv Syn 5w30 mix Fram EG filter
Re: PENZOIL Platinum HM lower oil pressure [Re: Rattler] #5159678
07/13/19 04:19 PM
07/13/19 04:19 PM
Joined: Dec 2018
Posts: 4
Mt
Rattler Offline OP
Rattler  Offline OP

Joined: Dec 2018
Posts: 4
Mt
I'll hook up a real mechanical pressure gauge. I know exactly what to expect from Mobil 1 on the gauge by the season, the pphm is a big change that is unexpected though in the way the gauge is acting.

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