Need Help Quick (Oil Pressure)

lovinspeed01 · 07-11-2003, 07:35 PM

I know this question has been asked before, but when it comes to my car I am very protective and would like advice directly.

My problem is lately I have been watching my oil pressure gauge and when my car is idling it sits at about the letter "a" in normal. When I slowly give it gas it slowly rises. At highway speeds (about 70Mph) it sits at the "r" to "m" in normal. My question is, is the idle oil pressure to low? Does any one know what pressure it is at when it reads "a" in normal? Should I be worried at all?

P.S. Car has not been driven that hard at all and I am almost 95% sure the gauge is reading correctly.

Thanks for any help

MEDIK418 · 07-11-2003, 10:21 PM

You're going to hear it pretty soon anyway but remember, you heard it here first. Dont' trust the stock gauge. Get a good numerical one. That said, the Ford manual gives one parameter for judging oil pressure in a 5.0. I may misquote this but if it will hold 25 psi at 1500 rpm, the manual says it's good to go. The part I can't remember for sure is the rpm listed but it was either 1500 or 2000 rpm. Anyway, I was surprised to learn there was nothing shown for idling pressure.

lovinspeed01 · 07-12-2003, 12:05 AM

The wierd thing is, is that tonight I did an oil change and put in 20w50 and the oil pressure is staying high. The oil pressure gauge never really moves, it stays at about the "o" in normal. I hope it will stay like this.

PKRWUD · 07-12-2003, 09:14 AM

You really, really need to use an aftermarket gauge. Yours won't tell you anything specific. You could line up 10 Mustangs like yours, same year, same model, same mileage, and odds are no two would have gauges that read exactly the same.

White GT · 07-13-2003, 03:46 PM

A good investment is

· Ford racing (autometer) oil pressure gauge
· Ford racing (autometer) temp gauge
· A guage cage with vents or a pillar mount in your mustang.

This is what i have on mine

And i can tell that the factory gauges are just for fun.

The reading s**** and they are not trustable.

Anyway what does NORMAL Mean. When you hit the red line it's too late

07-11-2003, 07:35 PM	#1
lovinspeed01 Registered Member Join Date: Apr 2003 Location: Alberta, Canada Posts: 46	Need Help Quick (Oil Pressure) I know this question has been asked before, but when it comes to my car I am very protective and would like advice directly. My problem is lately I have been watching my oil pressure gauge and when my car is idling it sits at about the letter "a" in normal. When I slowly give it gas it slowly rises. At highway speeds (about 70Mph) it sits at the "r" to "m" in normal. My question is, is the idle oil pressure to low? Does any one know what pressure it is at when it reads "a" in normal? Should I be worried at all? P.S. Car has not been driven that hard at all and I am almost 95% sure the gauge is reading correctly. Thanks for any help

07-11-2003, 10:21 PM	#2
MEDIK418 Registered Member Join Date: Mar 1999 Location: Amarillo, Texas, USA Posts: 780	You're going to hear it pretty soon anyway but remember, you heard it here first. Dont' trust the stock gauge. Get a good numerical one. That said, the Ford manual gives one parameter for judging oil pressure in a 5.0. I may misquote this but if it will hold 25 psi at 1500 rpm, the manual says it's good to go. The part I can't remember for sure is the rpm listed but it was either 1500 or 2000 rpm. Anyway, I was surprised to learn there was nothing shown for idling pressure. __________________ 1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet. Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.

07-12-2003, 09:14 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	You really, really need to use an aftermarket gauge. Yours won't tell you anything specific. You could line up 10 Mustangs like yours, same year, same model, same mileage, and odds are no two would have gauges that read exactly the same. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-13-2003, 03:46 PM	#5
White GT Registered Member Join Date: Nov 1999 Location: At the north of the Maine Posts: 177	A good investment is · Ford racing (autometer) oil pressure gauge · Ford racing (autometer) temp gauge · A guage cage with vents or a pillar mount in your mustang. This is what i have on mine And i can tell that the factory gauges are just for fun. The reading s** and they are not trustable. Anyway what does NORMAL Mean. When you hit the red line it's too late __________________ 88 GT * And Risen from the dead *** My GT My Web Page On Car domain

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07-12-2003, 12:05 AM	#3
lovinspeed01 Registered Member Join Date: Apr 2003 Location: Alberta, Canada Posts: 46	The wierd thing is, is that tonight I did an oil change and put in 20w50 and the oil pressure is staying high. The oil pressure gauge never really moves, it stays at about the "o" in normal. I hope it will stay like this.