At what oil psi will the red ! light come on at idle?

 

..

 

I believe it comes on at a little under 1 bar

 

Sorry Paul I do not know the answer. I saw it come on last night so I do know that it will come on if your wiring harness shorts out!

 

Sounds like a story in itself. Any followup? Mine started today with no cold start OP issues after 2 in a row, gee these 951's are so much fun.

 

Yeah I have a thread going,
https://rennlist.com/forums/924-931-944-951-968-forum/175816-smoke-in-the-engine-bay-944s-drivers-read-this.html

OP? you mean overpressure on your boost?

 

I changed the oil yesterday. For the winter I replaced Castrol 20/50 dino with Castrol 10/30 semi syn. and now at idle the light flickers and almost goes to full on. Then I drained 4 qts. and put in 4 qts. 20/50 with 2 1/2 qts. of the semi syn and it still happens.

Both times it only does it with the oil at full temp.

I was wondering what psi triggered the switch?

Merry Christmas to me, huh?

 

Sounds bad, what does the gauge read? I had Mobile 1 20/50 and just put in 10/30. I have not seen any change in pressure on the gauge.

 

About 1.5 bar (about 25 psi?), another 100 rpms past idle and the light goes out.

 

were you running synthetic before the light started coming on? If not the semi-synthetic might have washed out a bunch of goop in your system and unmasked a problem.

 

1.5 bar seems low in my experience.

Do you have a magnetic drain plug? Was there any metal flakes on the plug?
Can you detect any shiney particles in the old oil?

On a brighter side, Perhaps it is just a sensor or sensor contacts problem.

 

1.5 is low unless the car has been driven hard for long periods.

I myself never got lower than 1.7-1.8bar in summer (120+F, ~50+C) driving REAL hard with a/c on and using Mobil 1 0w-40, try removing the sensor and cleaning it 9internally somehow) or replacing it since it gets all sorts of oil 'gunk' in there?

 

hi,
for what it is worth a 10w-30 lubricant without a HTHS viscosity of 3.5cSt+ is not a good lubricant in these engines
A better lubricant is a 0w-40 or 5w-40. The oil must be Porsche Approved or at the minimum meet ACEA's A3/B3 quality standards. These viscosities are much better for winter use in your engine

Most OP lights are triggered at 0.5-0.75bar and are sometimes triggered by too low an idle speed

Regards
Doug

 

I remember reading in the owner's manual that is it normal if oil pressure drops to 1bar after long highway driving in hot weather.

Couldn't confirm this since i lost that manual........

 

4 quarts?
These cars take a little over 6 quarts. My "!" light comes on if the car is a quart low. That may be your problem.