Low oil pressure

dirty_d · October 10th, 2011, 12:38 PM

while running cold at idle I have 50psi, after its up to operating temperature I'm down to 15-20psi at idle and about 30psi at 2000rpm. Just put in fresh 10w-40, no difference. How much cause for concern is this? I'm guessing the crank/rod bearings are worn and need replacing?

Stevo077 · October 10th, 2011, 02:18 PM

Assuming the gauge is functioning correctly, low oil pressure is almost always caused by worn bearings. As the gaps between bearings and the other components widen more oil leaks out and the pressure drops. Sometimes a high volume oil pump can be added to help "get by" because it will pump enough that oil will still go everywhere it needs to...but that is just a band-aid fix. Eventually you'll need to rebuild the engine.

MustangMatt96GT · October 10th, 2011, 04:14 PM

That oil pressure looks fine to me! Start getting worried when you are getting less than 10 psi per 1000 rpm

Stevo077 · October 10th, 2011, 04:22 PM

Idk it seems kinda low to me. I have 30-40 at idle and about 70-75 at WOT, when my stang was stock it still ran 30 at idle and about 60 at WOT

MustangMatt96GT · October 10th, 2011, 04:44 PM

Every motor is different... The motor in have in my car now, I build with looser tolerances I have similar numbers to him. 10 psi per 1000 rpm is the industry standard.

dirty_d · October 10th, 2011, 07:03 PM

Ok, that's what I figured, it still runs really smooth. Maybe this winter I can get an engine lift and do it. It really sucks not having a garage though.

fogged306 · October 10th, 2011, 07:39 PM

I wouldn't worry about that either. I did the same thing as Matt and my car runs about 15psi hot at idle. Only have about 700 miles on this engine, and I'm not worried in the slightest. I'd leave it be if it was my car.

October 10th, 2011, 12:38 PM	#1
dirty_d Regular Join Date: Sep 2010 Posts: 58 iTrader: 0 reviews	Low oil pressure while running cold at idle I have 50psi, after its up to operating temperature I'm down to 15-20psi at idle and about 30psi at 2000rpm. Just put in fresh 10w-40, no difference. How much cause for concern is this? I'm guessing the crank/rod bearings are worn and need replacing?

October 10th, 2011, 02:18 PM	#2
Stevo077 Regular 1990 Mustang GT Join Date: Jun 2011 Location: NE Oklahoma Posts: 123 iTrader: 0 reviews	Assuming the gauge is functioning correctly, low oil pressure is almost always caused by worn bearings. As the gaps between bearings and the other components widen more oil leaks out and the pressure drops. Sometimes a high volume oil pump can be added to help "get by" because it will pump enough that oil will still go everywhere it needs to...but that is just a band-aid fix. Eventually you'll need to rebuild the engine. __________________ 1990 Mustang GT

October 10th, 2011, 04:14 PM	#3
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	That oil pressure looks fine to me! Start getting worried when you are getting less than 10 psi per 1000 rpm __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

October 10th, 2011, 04:22 PM	#4
Stevo077 Regular 1990 Mustang GT Join Date: Jun 2011 Location: NE Oklahoma Posts: 123 iTrader: 0 reviews	Idk it seems kinda low to me. I have 30-40 at idle and about 70-75 at WOT, when my stang was stock it still ran 30 at idle and about 60 at WOT __________________ 1990 Mustang GT

October 10th, 2011, 04:44 PM	#5
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	Every motor is different... The motor in have in my car now, I build with looser tolerances I have similar numbers to him. 10 psi per 1000 rpm is the industry standard. __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

October 10th, 2011, 07:03 PM	#6
dirty_d Regular Join Date: Sep 2010 Posts: 58 iTrader: 0 reviews	Ok, that's what I figured, it still runs really smooth. Maybe this winter I can get an engine lift and do it. It really sucks not having a garage though.

October 10th, 2011, 07:39 PM	#7
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	I wouldn't worry about that either. I did the same thing as Matt and my car runs about 15psi hot at idle. Only have about 700 miles on this engine, and I'm not worried in the slightest. I'd leave it be if it was my car.

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