Oil Pressure...

puppynut5 · September 1st, 2008, 05:59 PM

I have a 69 Mustang Coupe with a 302 and lately my oil pressure gauge has been reading low when I'm idling or driving slow.

I recently blew a header gasket that I haven't replaced yet, I don't think that would affect it but I could be very wrong.

Anyone have any idea?? The oil level is fine. I'm running 10w-30 full synthetic if that makes any difference.

Thanks a lot.

Kobra Killer · September 2nd, 2008, 02:23 AM

Where are you and how hot is it?
Maybe try 10W-40W during the summer

puppynut5 · September 2nd, 2008, 08:24 AM

I'm in Oceanside near San Diego... it gets a max of 90 here.

So if my car is running hot it will cause the oil pressure to drop??

69fastback · September 2nd, 2008, 08:28 AM

As it heats up, the oil gets thinner, therefore giving you less oil pressure. Has it always been like this, or did it just start happening? Where is the gauge running when you consider it low, because they will run more towards the low side of the gauge than the high side of the gauge? I hate that Ford doesn't put numbers on factory gauges.

puppynut5 · September 2nd, 2008, 09:02 AM

Well I always considered it fine as long as it was about a quarter way up from the first line... The last few weeks when I'm idling it will chill right above the line and not move above until I get moving.

Yeh I can't wait to put a new dash and better gauges in later.

460brevill · September 3rd, 2008, 09:19 AM

have you used a manuel guage to see what oil pressure is for sure?

white_fang · September 3rd, 2008, 09:56 AM

hey do u have a bad pump, lifter if u hear a ticking sound not sure if it is a lifter but 4 cyl in my friends jeep had one or two bad lifters and it dropped the oil pressure at idle but when she revs it up or driving it goes up. and a bad head gasket would lower but barely you wouldn't see a diff. check your back seal on the crank.

Builder1 · September 12th, 2008, 08:43 AM

I would go with the manual gauge as well, that way you know where you at. I second the 10w 40.

September 1st, 2008, 05:59 PM	#1
puppynut5 Newbie Join Date: Aug 2007 Posts: 25 iTrader: 0 reviews	Oil Pressure... I have a 69 Mustang Coupe with a 302 and lately my oil pressure gauge has been reading low when I'm idling or driving slow. I recently blew a header gasket that I haven't replaced yet, I don't think that would affect it but I could be very wrong. Anyone have any idea?? The oil level is fine. I'm running 10w-30 full synthetic if that makes any difference. Thanks a lot. __________________ PuppyNuts Studies show that 92% of kids listen to rap. If you are one of the 8% who still listens to real music put this in your signature.

September 2nd, 2008, 02:23 AM	#2
Kobra Killer Regular Join Date: Sep 2006 Posts: 123 iTrader: 0 reviews	Where are you and how hot is it? Maybe try 10W-40W during the summer __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

September 2nd, 2008, 08:24 AM	#3
puppynut5 Newbie Join Date: Aug 2007 Posts: 25 iTrader: 0 reviews	I'm in Oceanside near San Diego... it gets a max of 90 here. So if my car is running hot it will cause the oil pressure to drop?? __________________ PuppyNuts Studies show that 92% of kids listen to rap. If you are one of the 8% who still listens to real music put this in your signature.

September 2nd, 2008, 08:28 AM	#4
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,570 iTrader: 0 reviews	As it heats up, the oil gets thinner, therefore giving you less oil pressure. Has it always been like this, or did it just start happening? Where is the gauge running when you consider it low, because they will run more towards the low side of the gauge than the high side of the gauge? I hate that Ford doesn't put numbers on factory gauges. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player Last edited by 69fastback; September 2nd, 2008 at 08:31 AM.

September 2nd, 2008, 09:02 AM	#5
puppynut5 Newbie Join Date: Aug 2007 Posts: 25 iTrader: 0 reviews	Well I always considered it fine as long as it was about a quarter way up from the first line... The last few weeks when I'm idling it will chill right above the line and not move above until I get moving. Yeh I can't wait to put a new dash and better gauges in later. __________________ PuppyNuts Studies show that 92% of kids listen to rap. If you are one of the 8% who still listens to real music put this in your signature.

September 3rd, 2008, 09:19 AM	#6
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	have you used a manuel guage to see what oil pressure is for sure? __________________ i sixing 200 six with 300 hp.

September 3rd, 2008, 09:56 AM	#7
white_fang Banned 1996,mustang around 5's 0-60 Join Date: Apr 2008 Location: maybee Posts: 747 iTrader: 0 reviews	hey do u have a bad pump, lifter if u hear a ticking sound not sure if it is a lifter but 4 cyl in my friends jeep had one or two bad lifters and it dropped the oil pressure at idle but when she revs it up or driving it goes up. and a bad head gasket would lower but barely you wouldn't see a diff. check your back seal on the crank.

September 12th, 2008, 08:43 AM	#8
Builder1 Newbie Join Date: Sep 2008 Posts: 6 iTrader: 0 reviews	I would go with the manual gauge as well, that way you know where you at. I second the 10w 40.

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