change in oil pressure

[popz76]

On the way home today from a Memorial day event, I glanced down at the oil pressure guage and was surprised to see that I had only around 35 psi at speed( 4th and 5th) and nothing at idle ! The engine was running fine as usual, and after pulling over and checking it as much as I could, kept going and made it home with no problems. it has a 60 psi sender and guage and had been holding 35 psi or so hot. I have not put a mechanical guage on it yet, but will tomorrow. Any other suggestion will be helpful.

 

[doghead]

Did it used to have higher oil pressure than that(hot)?

Is your FDC bypassed?

Check for fuel in your oil(dilution).

 

[Bad_Carp]

Any loss of oil? (leaks)

Any gain of oil? (dilution)

You will lose some pressure as the oil gets hot, but you should never have a zero reading at idle.

 

[popz76]

Thanks.....we changed the oil a couple weeks ago...no leaks then or now. It was topping out at 60 till warmed up then around 35 when warm, and idle. I have not checked for dilution yet cause it's raining but will...then what? should I bypass the FDC ?

 

[popz76]

yea..that big O at low rpms really messed with me to say the least ! I was maybe 25 miles from home....

 

[dittle]

Bypassing would be the quickest thing to do...after you change the oil again if there is dillution.

 

[stampy]

If there is no oil dillution, what grade oil did you put in? It may have thinned excessively under heat and pressure. I always use Rotella 15W40 and add a little lucas to it.