A couple mechanics that I know says that a 235 running at 60 psi is nothing to worry about and that is nothing for an engine like the 235. I was advised to change oil to a 10W40 and to also add a quart of Rislone Engine Treatment when I change the oil. Rislone is suppose to keep engines clean, quiets noisy valves and lifters and suppose to restore lost power. Above all, its suppose to remove sludge and other deposits and improve oil circulation. Guess I may try that when changing oil, will put in a quart of Rislone and then 4 qts. 10W40 and see if that helps. If this does not help, may just put in a new oil pump. Don't know if I can find a spare oil pressure gauge to test with.
