my oil pressure gauge has been reading higher than usual after my last oil change. i think i overfilled it a little, but after driving it for awhile it reads right where its supposed to. the higher the rpm the higher the oil pressure goes up, it already hits 90psi by 3500rpm. i know the OEM oil pressure gauges are crap but it usually reads around 30psi. i was going to drain some oil out but the oil level is right where its supposed to be now. anything i can do to fix this????

 

What weight of oil are you using? As cold as it's been here, anything heavier than 5w- is going to be pretty stiff and cause the pressure to be a little higher...at least until you get it to operating temp. Be sure to stay out of boost until then.
Not positive, but I don't think over-filling it a little will cause any higher pressure. The oil pick-up can only take in so much.

 

If it were overfilled enough to affect anything, the oil pressure would, if anything, be lower due to foaming the excess oil, and you might also see more oil smoke as excess oil got into the PCV system during hard accel, braking, or cornering. Higher oil pressure would, as Sgtblue said, not be the result of an overfill.

Also, even if you used the same weight oil, the actual viscosity will not the same between different brands.

Dave

 

How does overfilling a rotary cause the oil to foam?

 

I may have spoken w/o knowledge here. If I was wrong, sorry.

That's general motor wisdom - for a rotary, I don't really know.

So what is the answer?

Dave

 

Pressure won't change due to high or low oil level. It WILL change with temps and heavier weight oil. I still have 20W-50 in mine and it PEGS the oil pressure gauge when I first start up.....not good!

And yeah, there shouldn't be any way that a rotary will foam the oil, since there is nothing boinging about into the pan.

 

I have had the same problem. Once its started getting cold out the pressure would skyrocket with any high rpm. I was told I could change to 5w-30 or 10w-30 and that sould clear up the problem.

-Derek

 

Your oil pressure is supposed to go up with RPM.....should be 30 psi at idle, 50-60 psi at 3000 rpm and going up to 100+ psi near redline.

Colder weather with heavier oil will have higher pressures. With my dual 25-row coolers, my oil pressure is always above 60 and is frequently at 90 psi.

EDIT -- and some of us have always said not to run 20w50 in the winter!