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Author
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Topic: Oil pressure problem
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 08-04-2005 07:44 PM
   
Ok, i have a el-cheapo electric oil pressure gauge, and have been noticing now that i'm driving the car that on cold start up sometimes i have about 40psi of pressure, which when warm drops to about 20 or below. Wondering if i should run a heavier oil for when the car is hot, or a lower temp thermostat to keep the oil a little cooler which might keep the pressure up some more.Anyone know when the stock oil pressure light comes on? It has never done so while driving, and i just got a new pressure switch, bulb comes on when ignition is on so i know that the bulb is still good. Wondering if the gauge is too crappy or what? ------------------
1974 Gran Torino(351W/c6)
My Page
Well it has primer on it now
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trashline
Gearhead Posts: 1808
From: Levittown, Pa
Registered: Dec 2003
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posted 08-04-2005 07:54 PM
I just went thru this. how hot is it outside? and what weight oil are you running now? I switched to 10W30 and my oil pressure dropped quite a bit. I drained and installed 20W50 and it is perfect now. and this is with a semi synthetic or blended oil. summer months Im gonna go with 20W50 and winter Im gonna run the 10W30.------------------
88 thunderbird TC 2.3L
66 mustang 200ci 3 speed
68 Fairlane 289 w/ auto
79 f150 300 3 onda tree
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 08-04-2005 11:52 PM
Running 10W30 in the car, temp is about 70-75 degrees outside at the moment, car has a 195 degree thermostat, car runs good for heat according to the temp gauge, right in the middle.The oil gauge reads 35-40 on cold start, and got down to what looked like about 5-10lbs tonight while driving  Not sure the accuracy of the gauge, but even if it's close it's quite low [This message has been edited by Dubz (edited 08-04-2005).]
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68 Coop
Gearhead Posts: 2869
From: Mesquite, NV. 89027 M&M# 4256
Registered: Oct 2004
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posted 08-05-2005 12:15 AM
Do you think you might have air bubbles in the line to the guage??? Don't know if it would make a difference or not.------------------
William
68 Coupe
289
Edelbrock 600
Performer Intake
Headers/X-pipe/Flowmaster 30's
C4
8"rear/2:79gears
"Restomod in Progress" Good friends are hard to find, even harder to leave, and impossible to forget.
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steve'66
Gearhead Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-05-2005 12:25 AM
Air bubbles in the line wont make a difference.The oil pressure light comes on with as little as 7 psi. A heavier oil will pick up the pressure, but not necessarily the lubrication. Is this a tired/stock bottom end? If so, it's OK. Run thicker oil. SteveW
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68 Coop
Gearhead Posts: 2869
From: Mesquite, NV. 89027 M&M# 4256
Registered: Oct 2004
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posted 08-05-2005 12:33 AM
Yeah, that's kinda what I figured, but ya never know. 
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N266fords
Gearhead Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 08-05-2005 01:38 AM
I might add if you are running a fram oil filter switch to NAPA gold or wix,by the way napa gold is wix. If its a fram it could be causing a restriction itself.
bruce
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 08-05-2005 01:45 AM
My old motor did that too. I ran 20-50w oil and a can of restore. Helped the motor make it another 3 years.------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 08-05-2005 04:17 PM
as far as i am aware there is 62000 miles on it, so i wouldn't think it would be too bad.If more pressure caused by a heavier oil won't help so much as lubricating better i don't think it would really be worth to switch would it? And the filter says Mopar on it, so that's probably the problem  Oil was changed out about 10 miles ago when I had the car into the shop to pull the oil pan. [This message has been edited by Dubz (edited 08-05-2005).]
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