What should the oil pressure be for a hot engine at tickover?

[felicitydavis1556]

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[rwmastel]

Tickover?

[JamesL]

Idle…

IIRC, the rpm and so pressure is different in gear vs neutral (Auto).

[BobH]

What should the oil pressure be for a hot engine at tickover?

At tickover or idle my car sits at about 30psi, but i've read that this can drop to 15psi, it depends on how much wear has taken place in the engine.  A new or refurbished engine will have a higher oil pressure than a worn engine.  It seems to be more important that the oil pressure under revs should be max on the dial @ 45psi and maintain this, rather than what it drops to at idle

There's more written in the technical manual, see the link top left, but you need to be a full member to access it, well worth it if you own or work on one of these cars

PS: assume you're asking about a W113, you didn't say what car, this may be different for other cars

[Sead]

M127 has at idle when warm not less than 2,7-2,8 bar. When drivin always 3bar
Rebuild engine.

[BobH]

As far as i can work out. 2.7 bar equates to 39PSI, I would normally bow to the experience and expertise of talented restorers such as yourself, the recent pictures of the early car you restored were sublime, however, many owners and other restorers on this forum agree that the readings from my car are quite normal and acceptable, and the engine does not need rebuilding. 

[MikeSimon]

1 bar equals close to 15.35 PSI

[Benz Dr.]

My engine runs 3 bar at all times, even at hot idle. I used a high volume oil pump when I built it about 25 years ago - it could be a pump from a M110 engine.

[ja17]

Oil temperature will change your oil pressure quite a bit also. After a brisk highway drive in warm weather you may see a lower oil pressure at an idle.   Slightly declining oil pressure on a high mileage engine over time can be normal. A sudden change in your normal oil pressure can be signs of a problem.

[BobH]

It would be interesting to see what other owner's engines idle at with 80K plus miles.  This extract from the Tech Manual again states that lower pressure at idle isn't a concern and is normal with wear

The service manual say oil pressure should be in the range of 2-6 atu (29.4-88.2psi). The gauge on the dash always reads 45psi even at idle it never moves off. I was told that once the car comes to idle (hot) the gauge should read about 15psi. So that’s why I am questioning whether my oil pressure is reading high or should I just not worry about it?

Will: I believe that the oil pressure CAN read 15 psi, hot, at idle, but does NOT have to. Not dropping below 45 psi at any time indicates that the internal parts of the engine are not showing any wear. Oil pressure is generated by the oil pump, relief valves, crankshaft main bearing clearance, crankshaft rod bearing clearance, camshaft bearing clearance. The evidence indicates that none of these areas is significantly worn. You mention the service manual gives a range of 29.4-88.2 psi, but then you were told the oil pressure should be 15 psi. These figures contradict each other. (FYI 15 psi is acceptable for an engine with moderate internal wear, hot, at idle, and is nothing to worry about either, even though it is below the normal 29.4 psi. The technical data manual states: "Operating safety of the warmed-up engine will not be jeopardized as long as the oil pressure at idle speed will not drop below 0.5kp/cm (squared) and will raise immediately upon acceleration." 0.5 kp/cm = 7 psi. Unless there is more to the story I feel your oil pressure is OK and you should not worry.

I wonder if someone can help with this follow-up question on oil pressure. At idle, with car in gear, my oil pressure gauge is no longer "pegged" to the maximum level of 45, but drops to between 30 and 40. Is this normal for idle (700 rpm) when the car is in gear and thus under load? I use Mobil 1 10w 30. Oil pressure is fully pegged at maximum at normal driving speed. Any damage with the oil pressure dropping this low?

I've always heard that it's normal for the pressue needle to be in the middle of the gauge at idle.

This sounds quite typical and not abnormal. The gauge should peg upon giving it gas. I wouldn't worry much at this point.

[Benz Dr.]

Oil pumps create volume, tight bearings create the pressure. Oil pressure can drop at idle but should be full on your gauge by at least 1,500 RPM.

[ja17]

Even with the same oil viscosity,  the type and brand of oil can make a minor difference in oil pressure. Less friction is less engine heat, and less engine heat is more oil pressure.

[BobH]

My car with about 80K miles pegs (what does that even mean?) at just over 1000rpm

Thanks for the comments

[ja17]

I suspect your oil pressure is fine Bob.  A sudden decrease in your normal oil pressure can be a sign of problems soon. Adequate and consistent oil pressure is good. Extremely cold temperatures, extremely hot temperatures and extended periods of very high rpms may cause some temporary, minor changes in oil pressure. If you are still nervous about your engine health, you can have periodic oil analysis done.