don't know the answer ,, but different oils will effect oil pressure ,,.I always used rotella in my 391 f -600 grain truck ,, guage was up on the 80 percent side , and even hot it varied less than 5/8s on the guage ,. had a guy do a tune up and oil change , he put o-reillys oil in it and the pressure was down around 40 percent..i have a DC Case , that carries 20 lbs at start up , as it warms up wide open it barely has 8-10 lbs ,, at idle it barely bounces the guage,,. another DC carries 35 lbs , my 800 Diesel carries low oil pressure too . I am told that perhaps the cam bearings are worn ,so far so good,,. my 4020 only carries 25 lbs cold,. and is less than 20 lbs ,.. most important in your problem ,, is what history occurred in this motors story ,,
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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