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If oil pressure were low(er) in a warm engine #4542316
10/13/17 02:55 PM
10/13/17 02:55 PM
Joined: Apr 2017
Posts: 426
Mississippi
Speak2Mountain Offline OP
Speak2Mountain  Offline OP
Joined: Apr 2017
Posts: 426
Mississippi
would a lower or higher viscosity motor oil successfully address it?

Re: If oil pressure were low(er) in a warm engine [Re: Speak2Mountain] #4542328
10/13/17 03:05 PM
10/13/17 03:05 PM
Joined: Sep 2015
Posts: 994
PENNSYLVANIA
JeepWJ19 Offline
JeepWJ19  Offline
Joined: Sep 2015
Posts: 994
PENNSYLVANIA
higher viscosity


2002 Jeep WJ 4.0 | Mobil 1 HM 5w30 |
TG8A | 2.5" lift | 148k miles

Software Engineer :]
Re: If oil pressure were low(er) in a warm engine [Re: Speak2Mountain] #4542353
10/13/17 03:25 PM
10/13/17 03:25 PM
Joined: Aug 2008
Posts: 21,245
ON, Canada eh?
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 21,245
ON, Canada eh?
The oil pressure on the gauge of my Santa Fe was always higher when cold and then would drop as it warmed up. It would also be higher with thicker weight oils as I experimented.

It was rated for 5w20 but I had put in some old 15w30 I had one summer just to get rid of it. I thought the needle was going to break off the gauge. LOL


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: If oil pressure were low(er) in a warm engine [Re: Speak2Mountain] #4542539
10/13/17 06:33 PM
10/13/17 06:33 PM
Joined: May 2016
Posts: 718
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 718
Canada


Yup, higher viscosity is handy:

As a teen I had a dodge slant 6, that groaned at idle - the main bearings had bottomed out
due to excessive wear/clearance and on-spec oil! Oil light was on even with a full crankcase!

Switched to 20W50, upped the idle a bit and drove it for 3 more yrs!

Re: If oil pressure were low(er) in a warm engine [Re: Speak2Mountain] #4542554
10/13/17 06:58 PM
10/13/17 06:58 PM
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
Castrol 10W-60 is the ticket for loose engines laugh


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: If oil pressure were low(er) in a warm engine [Re: Speak2Mountain] #4542583
10/13/17 07:23 PM
10/13/17 07:23 PM
Joined: Mar 2008
Posts: 5,963
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,963
South Florida
SAE60 is where it is at. I had a friend in high school ran that in his truck that called for 5w20. Blew his engine up 2 weeks later.


17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 Maxlife Syn 5W30
06 GMC Sierra Nextgen 10W30


Re: If oil pressure were low(er) in a warm engine [Re: Speak2Mountain] #4542796
10/14/17 12:04 AM
10/14/17 12:04 AM
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Very High Viscosity, but remember ... you may not be helping your motor that way. As long as there is an oil film on mating parts whether those parts should be under pressure or not, the oil is doing it's job. Higher viscosity oils may not be able to flow everywhere they're needed, when they are needed.

Personally, I have never been bothered by low oil pressure, as long as I knew the sump was full of oil and I had a reasonable reading. As engines wear, tolerances increase, and that is normal. Wide tolerance motors generally start easier than tight tolerance motors. In cold weather, they start much easier. This means less wear and tear on things like starters and batteries.

By "reasonable reading, as long as I have at least 10 PSI at idle, I am good to go. There is no real reason to need more, "just because".

Bends in oil lines or oil filter / cooler fittings (especially sharp bends of 90degrees or more) and various machined passages will raise oil pressure without benefitting the lubrication of the motor, in fact they are a detriment to it.

It's OK if you know the engine and it's tendencies and at that point find your oil pressure is unusually low or high, but if you are just panicking for no reason it's time to take a step back and find out what numbers you should be getting. Where you place your gauge or sender can affect the reading as well; if the numbers seem out of range, take the necessary steps to rule out unintended consequences that may be giving you an improper idea of what the pressure is at the critical areas (typically main bearings).

It's not difficult to drop the pan on many motors and have a look, do a measure, and even replace worn bearings before buttoning it up again.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Im getting a warm engine rattle when I restart [Re: Johnny2Bad] #4542871
10/14/17 05:43 AM
10/14/17 05:43 AM
Joined: Apr 2017
Posts: 426
Mississippi
Speak2Mountain Offline OP
Speak2Mountain  Offline OP
Joined: Apr 2017
Posts: 426
Mississippi
Google search say:might be oil pressure

Re: Im getting a warm engine rattle when I restart [Re: Speak2Mountain] #4544129
10/15/17 01:24 PM
10/15/17 01:24 PM
Joined: May 2016
Posts: 718
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 718
Canada

Old vintage engines tolerate thicker oil better then new engines with much tighter clearances
and higher piston speeds where on-spec oil is needed to lube the pistons 'just right'.

While I slapped in 20W50 in a Slant 6, (that being the heaviest oil I could get in town)
I would not want to try it on a late model engine!!

Re: Im getting a warm engine rattle when I restart [Re: i_hate_autofraud] #4544183
10/15/17 02:48 PM
10/15/17 02:48 PM
Joined: Apr 2008
Posts: 37,917
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,917
Ontario, Canada
Originally Posted By: i_hate_autofraud

Old vintage engines tolerate thicker oil better then new engines with much tighter clearances
and higher piston speeds where on-spec oil is needed to lube the pistons 'just right'.

While I slapped in 20W50 in a Slant 6, (that being the heaviest oil I could get in town)
I would not want to try it on a late model engine!!


BMW until very recently spec'd 10w-60 for their "M" engines and Ford spec'd 5w-50 for the Coyote when in "Track Pack" form, despite spec'ing 5w-20 in plain-jane GT form.

Also, temperature is a far bigger driver of viscosity than what you see on the bottle. At -30C 0w-20 is going to be much, MUCH heavier than 20w-50 in Arizona.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT

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