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Originally Posted by 40 Deluxe
New NAPA unit turns light on anywhere from 3 to 8.3 lbs. so Ford apparently thinks this much is OK.
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The sending unit for the 'idiot light' turns it on at about 3 to 5 lbs. (some 7 to 8 lbs.) if I remember right.
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This is my impression, too, for idle pressures. As I recall, my near brand new S-10 Chevy had idle readings under 10 lb.s (I think) and I was worried and called the warranty center, and they said it was fine as long as the warning light didn't come on. I put 150k miles plus on the truck. When I had my '50 Plymouth flathead six several years ago, the manual said ANY indication on the gauge that there was even a trace of pressure at idle - even a couple of pounds - was acceptable. I don't think that's the Ford standard, but the oil requirements at idle weren't great.