what is "normal" oil pressure? 88 jag 3.6

 

I don't have specs/manuals for your car. However, I have info for the 4.0 "AJ16" engine which is the same engine family as your 3.6

At idle speed: 7.2 PSI minimum
At 4000 rpm: 70 PSI (which seems rather high to me)

Others may come along with XJ40/3.6 specific info

What readings are you getting?

Personally, if it's 5-10 psi at idle and 35-40 psi in normal driving/cruising (not high rpm work) I'd be comfortable

Remember that readings are naturally higher when the engine is cold

Cheers
DD

 

For the AJ6 engine specs are as follows.

At idle: 30 PSI minimum (which seems high to me but my 4.0 does indeed register in the low 30s at idle.
At 4000 rpm: 70 PSI minimum.

Also remember that the gauges can be flaky, if you suspect a problem, replace the sending unit with a pressure gauge and check.

Cheers,

Allan

 

Thanks Allan.

Curious thing, the difference in idle specification. I wonder what differences account for this?


Cheers
DD

 

I'm not sure Doug, I believe the oil pump was the same. The AJ16 did have additional oil drain holes in the top deck to aid return to the sump. I would think this would lower pressure somewhat but 30 to 7.5 PSI is a big drop.

Cheers,

Allan

 

my oil pressure usually hangs around 30-40 at idle (if im calculating it correctly. not used to these types of gauges, so excuse me for my ignorance) but goes up to usually 2 or 3 dashes shy of the 8. would that mean around 70?