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I have a 1967 M20 E with 2170 hours on a smooth running engine with good compression on all cylinders. 988 hrs since top overhaul in 1982. In 1973 the engine received new main bearings @ 529 hours to comply with Lyc SB 3200. The engine oil pressure on the gauge after warm up shows 55 psi at 900 rpm ( lowest it will run with throttle back to the stop) 65 psi at 1200 rpm and 70 psi at 1700 rpm. I normal idle at 1200 rpm. I purchased the plane 2 1/2 yrs ago and have only flown 25 hours. What could be done to access the health of this engine? I know I could do a soap sample and have it bore scoped. Any thoughts would be appreciated. I realized I may be looking at an overhaul but not sure since in runs good. Thank you
