360duster1973
USarmyRANGER
I bought my 73 duster from a knuckle head about 3 years ago hadn't noticed the oil pressure was extremely high until I installed a oil pressure gauge. Cold start it was reading about 70 psi and 65 psi at a warm idle which I knew was a red flag. I then went and replaced the easy things first the oil pump, lighter weight oil, a new oil pressure gauge, and checking the pan for clumps or debris. Lifters and crank are getting oil. After giving up for the winter I started with going back to the forums and went and bought some Marvel Mystery Oil and figured I'd give it a shot. I drained about a quart from the new oil and added the MMO. After about 2 hrs the psi dropped down to 48-50 psi.
What else can I do? Is there a stronger product I can use to help break up the blockage?
What else can I do? Is there a stronger product I can use to help break up the blockage?