velns

Just changed a oil to 5w-60 Belray superbike oil as to pro car racers suggestion, and now wondering about idle oil pressure, it's down to 3bar, i dont ever remember seeing so low!!!! hmmm..........
What do you think? Should I be worried?

eyeball kid

Mine is b/w 2.5 and 3.5 when at idle--hot. 79k on car.

eyeball kid

Mine is b/w 2.5 and 3.5 when at idle--hot. 79k on car. 20-50 Redline.

ehall

Is that a hot or cold idle? What oil and Idle pressure did you have before, under the same conditions?

Keithr726

2bar hot idle. 20-50

Fluidplay

At start up just under 5 at idle, when warmed up 3.5 -4, after driving around a bit 2.5 -3. I've had it drop as low as 2 at idle after some hard runs during an AX event. New oil pump and using VR 20-50

As ehall states makes a big difference between start up pressure and after driving for some time and even more so if you're running it hard.

velns

The car is about 30k after rebuild. It was not lower than 4bar under hot idle. And always up to the gauge even with a little rpms or cold.

What do you think, was it a good idea to use a premium motorcycle oil in a car?

ehall

Your guy probably had you run motorcycle oil due to it's increased ZddP content.
What oil viscosity were you running before?

velns

Previously 20w-50

rdanford

2.25 bar hot...Mobil 1 0W-40...110k on car, 2k on new rod bearings...

Keithr726

From the owner's manual...

velns

Engine sounds different after oil change, it seems that oil is very light, actually it does sounds worse than previously. I can hear a lot more of mechanical stuff, a crankshaft I think.....
Racers are telling me that everythink is fine, but I am still worried about that.

velns

Keithr726: doh...... jesus..... 0.5bar sounds too bad!!!
Okey, I gess everyone is getting +/- the same, so I dont have to be worried about oil pressure!!!
Thank you !!!

ehall

20W-50 is much thicker than 5W-60. It's thicker than the number would indicate. I ran AGIP 4T 10W60, in my 86. My pressures were much like yours. However, I live in a hot climate.
Due to cost, I run Valvoline VR1 Racing 20W-50. My pressures are higher.

velns

But, is that safe for my engine interms of longelivety? I mean runing it with 5w60?