Hi Guys,

I'm quite the lurker, great forum and thank you to all the contributors!

There seems to be a few threads about oil pressure might be often, so I apologize if this is a duplicate and I'm boring you, but I can't find any info explaining my readings so I thought I'd ask. A keen mechanic would know but I'm starting here as many of you are keen as well.

Let's assume the gauge and sending unit are good. I understand 10PSI per 1000RPM is acceptable. From what I gather 4.0-5.5 bar (58-80PSI) @ 5000RPM is acceptable. Warmed up idling pressure on the very early engines will be low, like 5 PSI, maybe even Zero. Correct any of this if I'm wrong. These are the guidelines I've found.

Here's what I am seeing which I'm unsure of. Any analysis will be much appreciated and I thank you in advance.

When the engine is cold, the usual higher pressures are present on the gauge.

When engine is at least 180F:
Needle hits the 0 PSI mark at idle
Maintaining 3000RPM in gear cruising = Oil Pressure is roughly 19PSI
Accelerating 1/2 throttle @ 5000RPM = 65 maybe 70PSI (Hey this is good! )
Accelerating 3/4 to full throttle past 5500RPM = The gauge is pinned at 140PSI

Are these readings a problem? are they normal? 140PSI doesn't seem right and the 19PSI at 3000RPM cruising is not right according to the rule of thumb.

The engine runs like a champ and barely ever smokes during 1 out of 20 cold starts.

Thanks again guys!