Can someone enlighten me...

When my truck is cold and idling, the oil pressure is midway on the stock (72 F250, 390) guage. When it warms up and/or when I go faster the indicator drops.

When I'm on the freeway, warmed up and doing 75, the indicator drops down to the bottom (oil pressure is LOW) of the scale.

The truck seems to run fine all the time. The oil looks good through it's life span, and it gets changed every 3k since I've owned the truck.

Oil is 10-W40.

I would have thought... higher RPM's... would equal faster oil pump rotation... would equal higher oil pressure.

If anyone has any thoughts, I'd appreciate hearing them.

Thanks.

 

Put a mechanical gauge on and find out whats really going on.....

 

Agree with above, do you hear any noise when the oil pressure indicator drops? My stock oil pressure gauge was so inaccurate it wasant even funny.

 

Pressure will be higher when the engine is cold....

You really need to know what you've got at speed and warmed up. As stated, look at a good pressure gauge.

 

it could be a bad sender but with the stock ones you can never tell really what it is

 

Thanks guys...

I'll get a mechnical guage. Do I screw that into where the sending unit is screwed in presently?

It doesn't make any noise when the guage indicates "Low". It just purrs along.

Maybe I should just replace the sending unit. I imagine they are somewhat cheap.

The guage is OK, because I can ground the lead off the sender and the guage deflects full scale.

Thanks again for the ideas.


samckernan

 

Yes you just connect the fitting for the mechaincial gauge where the sender is. Before I converted to mechinical gauges, I replaced the sender, still didnt help the gauge was way off. Im sure its just the gauge/sender thats giving you a inaccurate reding.

 

You could also put a T in and use both, thats what I've got.