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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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