Experimented on my machine today. Duplicated the highway run that produced the flickering oil pressure light. Stopped and checked idle oil pressure. It was 10 psig. Shut engine off and quickly checked oil level. It was normal. Obviously it was not actually low when I put in a quart of oil the other night (dark; bad eyes), because I had to remove a quart earlier today to get it down to the full mark on the dip stick. I'm now convinced that it is draining back to the pan normally.
Put on a new oil filter this evening. Exact same results as before after revving the engine in park for about five minutes. No idiot light, but pressure was 10 psig at idle. Checked idiot light on the bench. It appears to close at about 4 psig decreasing as the spec says it should.
I should mention that this machine has had regular oil changes throughout its life. Oil looks very clean. Have never found any foreign material from the oil pan during changes. Also normal consumption is virtually nil. However, I have to concede that worn out bearings are a possibility.
Any more thoughts?
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Originally Posted by Madcat455
The oil pressure readings sound OK.... Not what they'd be new, but within tolerances for your milage.
Are you sure the oil level was low when you added the quart?? Run the car for a while like you did that one time.. and see if the level drops again... Could be that you're Oil return Galleys that drain the oil back from the head to the block are getting restricted.
That'd explain why it'd be low after driving for awile, then be over full the next day after sitting.
Only way to check for sure is to try to drive it again to recreate the problem.
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