Conshy11

Hi - I have a 6 speed 2007 911 Base w/ 60k miles. I recently purchased the car and the low oil pressure light was coming on at .5 bar. I had the local Porsche dealer replace the sensor.

The low oil pressure light stopped coming on, but the car still idles at .5 bar even when warmed up.

When I first start the car, it’s at 4-5 bar, then eventually it’ll drop to .5 at idle. When I start driving it bumps up to around 3 bar.

Is this normal? I was told by a local Indy that inspected my car that idle at .5 bar was normal.

rtl5009

.5 is a little low at hot idle. What oil are you running exactly?

I like to see atleast 1 bar at hot idle.

Conshy11

Not sure which oil was put in. The local Porsche dealer change the oil and sensor so I am assuming whatever oil they used was correct.

What oil do you recommend?

rtl5009

I bet it’s a 0w-40, I would go to 5w-40 and switch out the oil pressure bleed plunger and spring and doing when you do the change.

Conshy11

Thank you for the info. I’ll try that out.

Fahrer

I don't think it is the oil. My 2008 C2S shows 1.5 at idle when hot. I use Mobil 1 0W40. It is likely the gauge is not calibrated or the bypass.

steveP911

Where do you live? Is it cold enough in the winter to warrant using 0W-40? See Porsche manual below. I know it says a 0W is okay along with 5W at the higher ambient temperature, but I use a 5W oil (5W-40 Liqui Moly), and I am inclined to start my engine (cold) with a higher viscosity oil.

And here's all I can find in the manual about normal operating oil pressure. I have a 2005 S and my normal warm idle is 1-3/4 to 2 bar. I am not sure what I see at exactly 5000 rpm but I suspect it is more than 3.5 bar, maybe closer to 5 bar.

Good luck

Graufuchs

Same as above...you want to take preventative steps against BS (Bore Score) by using a high moly based oil.

5w-40 Driven Or Liquimoly Oil....I would avoid a 0w-40 oil.

Conshy11

I live in PA (just outside of Philadelphia).

Thanks for the help. I’ll reach out to the dealer to find out what oil they used.

rtl5009

I live in Collingswood- you buy and bring the materials and I’ll do a full oil change/ r&r the bypass plunger and spring for $100.

LMK.

LucV

How do you calibrate the gauge?

jbkusa

OP… I’d take him up on that!

Petza914

5w40 or 0w40 makes no difference when you're talking about hot oil pressure as that's the 40 value in both oils. I woul put in Driven DT40 which is a better 5w40 and see if it improves as it's a significantly better oil.

0.5 bar pressure is low. I also see way more pressure on my cars than 3.5 bar at 5,000 rpm too. I've never seen a pressure below 4 bar at 4,000 rpm even driving when it's 120 F outside in FL.

rtl5009

^ this is a Miss conception. Yes the hot weight is the same but 40 weight is a range. The additives use to address the winter weight cause 0w (generally) to be on the lower end of that range when hot.

Petza914

And the wider the spread the more viscosity modifiers are in the oil. As those wear the range narrows and usually shifts toward a lesser viscosity