Join Date: Aug 2019
Location: Northville Michigan
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Low Oil Pressure at Idle (Maybe)
So I have recently noticed that my oil pressure on my 68 GTO seems to me, to be very low at idle. By very low I mean when the engine is totally warm, and I sit at idle for a minute, oil pressure can drop to 10 or even nine psi. This only happens when warm, at initial startup idle pressure is at about 40 psi. Idle when warm is at about 600-700 rpm. On the other hand, as I start to accelerate it climbs steadily and when Im at about 15 or 1800 RPM, I’m back up to 55 or 60 PSI. I’m trying to figure out if this is normal, or not. I am running 10 W 40, Brad Pen oil, and recently change my oil filter just for good measure. What do you Guys think? Any idea what would cause this, or is it even normal? The engine actually runs perfectly, knock on wood. Even at idle at nine psi, I hear no sign whatsoever of a tappet tick, of any sort or any other unusual sound - it idles perfectly. In fact when I open up a oil cap, I see plenty of green oil on rockers moving all over the place! Also no sign of oil leaks, no oil in water, and the oil level is not decreasing. Like I say, if I didn’t have a gauge, I wouldn’t even know about this to worry about it, maybe I should remove my gauge! :-)
I should’ve mentioned, my counsel is a Dakota digital, that was installed when the car was rebuilt a year or so ago. Again, I don’t know if this is new or not, possibly it is the first time I’ve noticed.