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04-29-2014, 07:18 PM
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#1
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Senior Member
Join Date: Dec 2012
Location: McKinney
Posts: 144
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5.0 Oil Pressure Questions...
So my 5.0 is running the factory oil pressure gauge and I keep a kinda paranoid eye on it..
At cold start it runs about 3/4 of the way up the gauge, looks great. The problem comes up when it gets hot and sits at idle it can drop to about 1/4 on the gauge. Now since the gauge has no damn numbers at all I have no idea how unhealthy that it...
Is that typical for a 5.0? It's running 10w30 right now... it should be perfect right?
Any cons to running a straight 30 next oil change?
__________________
Current Ride: '91 LX Hatch 5.0 - 434WHP, Trashed Synchros, Slipping Clutch and Rattles For Days
Other Ride: 1987 Dodge D150
Previous Rides: '80 Escort MkII, '08 Bullitt, '50 F1, '48 Chevy, '67 El Camino, '50 Chevy, '13 Dodge Dart Turbo
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04-29-2014, 07:54 PM
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#2
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Senior Member
Join Date: Mar 2013
Age: 34
Posts: 1,047
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5.0 Oil Pressure Questions...
Not the same, but not totally different. My 5.0 Bronco's oil pressure gauge goes all over the place. The truck has less than 100k and has been well maintained. After some reading it turns out that the gauge is nothing more than a dummy gauge. The sending unit is basically a switch. At some magic psi the gauge will read normal. A lot of the time the mechanism inside of the cluster is the culprit for the gauge being so jumpy. My neighbor, who owns a shop, said that if the gauge reads at all you're fine. Best bet is to install a mechanical gauge if you're worried.
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The Queen:
2013 Race Red Mustang GT 6MT: 20" AMR's, GT500 AB, JBA LT's and ORX, SCT SF3/X3, MGW Short Throw, Some Carbon Wrap, Spoiler Delete, Eibach Sportlines, Koni STR.T's, BMR LCA's, BMR Relo Brackets, BMR UCA, Freedom Racing PHB, Maximum Motorsports CC Plates, BMR Safety loop, DSS Aluminum DS
Last edited by JDMLOL; 04-29-2014 at 08:22 PM.
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04-29-2014, 09:29 PM
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#3
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Senior Member
Join Date: Dec 2012
Location: McKinney
Posts: 144
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Originally Posted by JDMLOL
Not the same, but not totally different. My 5.0 Bronco's oil pressure gauge goes all over the place. The truck has less than 100k and has been well maintained. After some reading it turns out that the gauge is nothing more than a dummy gauge. The sending unit is basically a switch. At some magic psi the gauge will read normal. A lot of the time the mechanism inside of the cluster is the culprit for the gauge being so jumpy. My neighbor, who owns a shop, said that if the gauge reads at all you're fine. Best bet is to install a mechanical gauge if you're worried.
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See that's kinda what I figured, that's most likely why the whole range of motion is labeled as 'normal'. Lol.
I guess at some point I'll just invest in a real gauge and sender. 
__________________
Current Ride: '91 LX Hatch 5.0 - 434WHP, Trashed Synchros, Slipping Clutch and Rattles For Days
Other Ride: 1987 Dodge D150
Previous Rides: '80 Escort MkII, '08 Bullitt, '50 F1, '48 Chevy, '67 El Camino, '50 Chevy, '13 Dodge Dart Turbo
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04-29-2014, 10:01 PM
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#4
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Old School
Join Date: Oct 2012
Age: 46
Posts: 1,358
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its probably a little low, switch to 10-40 or 20-50, that will help some. My 408 was so damn hurt internally it was 8-10 psi hot, which would be like the red line on your gauge. as long as you have 10 psi per 1000 rpm you will be good to go. idle pressure isnt really important, as long as it shoots up when you give it gas.
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86 GT 374 Billet "W" w/ 72MMs
90 GT 351 Dart short stroke w/ YSi
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