Oil pressure and highway speeds

[Rolltide1006]

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Lol ya I am running 5w-20. Going to put 5w-30 in it and see what it does when it’s nice and hot


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[lwarrior1016]

If your oil pressure keeps getting lower, it’s not the oil that’s doing it. I run 5w-20 in all my stuff, even my 318k mile 5.4l in my truck.

 

[Rolltide1006]

If your oil pressure keeps getting lower, it’s not the oil that’s doing it. I run 5w-20 in all my stuff, even my 318k mile 5.4l in my truck.

Changed the oil (3rd time since firing the motor up.) I noticed there is still a fine material from things wearing together. Motor has less than 5k miles on it.


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[OLD H2S]

OIL WAR..is on, yours is junk mine is gold.

 

[Rolltide1006]

OIL WAR..is on, yours is junk mine is gold.

Motor is tapping around cylinders 7-8. Yay


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[lwarrior1016]

OIL WAR..is on, yours is junk mine is gold.

No war here, brother! If anyone would know, it’s you. I just told OP what I used and I thought that he had a bigger issue if his oil pressure is going down.

 

[lwarrior1016]

Motor is tapping around cylinders 7-8. Yay


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In your original post, it sounds like you me oil pressure when hot never goes over 50 psi. That is an issue. Good rule of thumb is 10psi per 1000 rpm.

If you have to go back in to it (sounds like you might), get yourself a 3v/gt500 pump and pickup tube with billet gears from boundary pumps. You’ll never have an issue again.


I lost my first build to an oil pump issue. Never saw over 55 psi when hot and I was turning 8k+ rpm. It didn’t last long.

 

[OLD H2S]

Jeez, all week and I can't get an oil war going? Every forum has oil wars...

 

[Rolltide1006]

In your original post, it sounds like you me oil pressure when hot never goes over 50 psi. That is an issue. Good rule of thumb is 10psi per 1000 rpm.

If you have to go back in to it (sounds like you might), get yourself a 3v/gt500 pump and pickup tube with billet gears from boundary pumps. You’ll never have an issue again.


I lost my first build to an oil pump issue. Never saw over 55 psi when hot and I was turning 8k+ rpm. It didn’t last long.

Ya I will drop the motor in a week. I have 4 motors apart at work already and no lift available. Big time bummer. This is the 2nd rebuild on this motor within 2 years. First time it started knocking was a year after the first build. Cylinder 1’s rod bearing spun. Now there is tapping around cylinders 7-8. I can’t tell which one with the stethoscope, but narrowed the tap down to there. I need beer lol [emoji481]


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[OLD H2S]

Dang, we must be cousins..

 

[AStangThang]

Hello all and I apologize if this issue I am having has been answered before. I can’t find my particular issue discussed on google Oil is full and is Motorcraft 5w-20 with a Motorcraft oil filter. Wiring to the autometer gauge is [emoji108][emoji2532]

I have a 97 GT and hooked up a autometer oil pressure gauge to know where I am at. The motor is a 4.6 2v and has PI heads, blower cams and was rebuilt 2k miles ago. Oil pressure is 70-80psi on cold start and I never lose it or see it drastically change. When nice and hot, I am idling with 20-25 psi. Once i bump the throttle it shoots to 50 psi. When I accelerate hard from a stop I see a nice gradual climb with pressure all the way to 60-70 psi. When I am driving on the highway is when I notice a slight fluctuation. When I am going 70-75mph in 5th gear at about 2200 rpm I noticed the meter was at 50 psi. I give it throttle and the needle will drop slightly down to about 45 psi and once I let off the throttle it will jump back to 50 psi. When I am at the same speeds and drop it into 3rd and accelerate the pressure goes to 55 and doesn’t climb as quick as it does when I am messing around in town. This is my first time having a aftermarket oil pressure gauge so I may be just a little paranoid. Just wanted to hear yalls opinions and/or experiences. Am I crazy or what? Thanks in advance!


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I have a 97 GT also, but a stout little npi. I use 5w30 castrol synthetic w/ a quart a synthetic Lucas, its got 40k on the engine, ran that oil ever since after break in, runs like a top.