I have a '98 Chevy 4x4 3/4 ton with 34,000 miles. I have the typical oil pressure guage. 0-1/4mark(20 lbs)-40 lbs-3/4mark(60lbs)-and 80 lbs. When I am idling , it sits at just above the 1/4 mark. I guess that means it is at 22lbs. Then it goes to just above 40lbs when I am moving. That seems rather low, doesn't it? My Grand Cherokee sits at 40, then goes to 60 when moving-and it has 94,000 miles. My question is this- is this normal? I don't have much time to get it pressure tested at the garage.