Normal oil pressure? 911 SC

[white-tt]

I am not quite in a panic yet, but want to know if I should be. I noticed higher than usual oil pressure today. I will attach a video to see the revs vs. pressure, to more easily judge if they are normal.

A few days ago I topped off my oil (added about 2/3 quart). I talked to a very reputable shop in Denver that did my last oil change (result of a PPI where studs were checked), and the owner told me he used 15w-40 in the car. He recommended to buy some 10w-40 castrol to top off. I did so a few days ago, and I'm not sure if the oil press actually went higher today or if it is just the first time I've noticed it.

The car idles at about the 3 (bar?atm?) mark on the gauge when cold.
1st gear - the car is pretty much pegged at 5 at 2000rpm+
2nd gear - pegged at 5 at 3000rpm+
and so on...

Here's a video where the car wasn't quite up to temp, but wasn't completely cold either. The pressure had settled down a little, but was still higher than I remember before.
YouTube - ‪Oil pressure‬‏
Is this normal? Could the different oil have caused this?

[tcar]

FWIW, BAR and ATM are the same thing, about 14.5 psi. (Standard air pressure at Sea Level.

Check the pressure when it's at operating temp. i.e. close to 200* F.

Should be roughly 1 bar/1000rpm.

[white-tt]

Originally Posted by tcar

FWIW, BAR and ATM are the same thing, about 14.5 psi. (Standard air pressure at Sea Level.

Check the pressure when it's at operating temp. i.e. close to 200* F.

Should be roughly 1 bar/1000rpm.

First, thank you for your response!

I know they are close to the same, 1 bar being ~14.5psi, and 1 atm being ~14.7. I was just unsure which it technically is meant to be.

I will check later. Unfortunately, my commute to work this morning wasn't long enough to hit operating temp. I'll take a longer route home

I've hard the 1/1000rpm 'rule', but is it normal to really be this high when cold? I don't remember it being this high in the past. Even in the colder months (It's relatively warm today), I thought it was lower at startup. Maybe I don't remember correctly...

[Eagledriver]

It will peg at 5 bar when cold above about 2000 RPM. When hot it should be between 3 and 4 bar at 3000 RPM for a heathy engine. Also your guage can be in error. Mine jumps around sometimes and I could use a new sender.

-Andy

[white-tt]

Originally Posted by Eagledriver

It will peg at 5 bar when cold above about 2000 RPM. When hot it should be between 3 and 4 bar at 3000 RPM for a heathy engine. Also your guage can be in error. Mine jumps around sometimes and I could use a new sender.

-Andy

That's good to hear it is normal. I guess I just haven't noticed it that high when cold before. (That seems to be the consensus, anyway) I thought I was more observent than that. D'oh. Thanks.

[JJ 911SC]

Here is a quick check to take the guage (and the wire) out of the equation.

With the car idling, unplug the electrical connector of the top of the Pressure Sender and you guage should peg to 5 (another bad fail system from Porsche but that is another story).

Then ground the connector and it should go to zero. If it does not go to zero, the cable portion on top of the engine has been cook to a crisp and develop some resistance.

[JJ 911SC]

Originally Posted by Eagledriver

... Mine jumps around sometimes and I could use a new sender.

-Andy

Andy

It could be a loose connection on top of the sender, BTDT

Just watch the guage while you play with the connector.

[DRACO A5OG]

Yeap, normal when cold engine.

If loose or bad connector, she will peg at 5 at all times.

If you want to make sure as a buddy to swap out gauges to test.

[white-tt]

Took a little ride around the bench here in Salt Lake. Getting the temperature up definitely helped. It still seems a bit higher than before. It definitely doesn't peg at 5 at operating temperature, at least not all the time. It doesn't seem to be a faulty gauge. The gauge moves as it should. At full operating temperature it seems to be 1 bar per 1000rpm +1.5 bar. In other words at 3000 rpm, it reads 4.5, and at 2000rpm it reads 3.5, etc... (give or take). Would that be considered higher than usual?

-also, thank you everyone for your replies so far! I love these boards.

[JJ 911SC]

Originally Posted by white-tt

Took a little ride around the bench here in Salt Lake. Getting the temperature up definitely helped. It still seems a bit higher than before. It definitely doesn't peg at 5 at operating temperature, at least not all the time. It doesn't seem to be a faulty gauge. The gauge moves as it should. At full operating temperature it seems to be 1 bar per 1000rpm +1.5 bar. In other words at 3000 rpm, it reads 4.5, and at 2000rpm it reads 3.5, etc... (give or take). Would that be considered higher than usual?

-also, thank you everyone for your replies so far! I love these boards.

Are you still iddling at 3 as per post 1?

[kodioneill]

Originally Posted by white-tt

Took a little ride around the bench here in Salt Lake. Getting the temperature up definitely helped. It still seems a bit higher than before. It definitely doesn't peg at 5 at operating temperature, at least not all the time. It doesn't seem to be a faulty gauge. The gauge moves as it should. At full operating temperature it seems to be 1 bar per 1000rpm +1.5 bar. In other words at 3000 rpm, it reads 4.5, and at 2000rpm it reads 3.5, etc... (give or take). Would that be considered higher than usual?

-also, thank you everyone for your replies so far! I love these boards.

Your pressure is totally normal do not worry.

[white-tt]

JJ - Depending on the warmth of the car it idles at around 1-2 normally. Sometimes even when its indicating the car is at operating temp, it will still idle around 3, but I think that's just normal error in the temp gauge. It still is about 1bar/1000rpm+1.5 bar (2.5 bar at 1000, 4.5 bar at 3000, etc...) once moving, though.

kodionell - Thanks, it's good to hear everyone's opinion that it is most likely normal. I just noticed a difference in pressure, as I could have swore it ran lower pressure just a week ago, and got a bit worried.

[JJ 911SC]

As long as you got an increase with the RPM it indicate normal operation.

There could be 3 reasons why you are at 2-3 at idling.

It could the gauge, easily check out by unplugging the wire from the Sender (goes at 5) and grounding the wire from the sender (goes to 0). You can do the same test for the Oil temperature gauge;

It could be the Sender developing a resistance (not getting to 0 ohm under low pressure condition); or

Your car could have been upgrade with an Updated Camshaft Oil Line Restrictor Kit which does increase the Pressure Porsche 911 & Carrera Cam Towers & Timing Chains - Page 1