Old engine overhaul/replacement advice

You can try adding a 1/2 thickness washer under the oil pressure relief valve, that will increase the oil pressure.
As far as temps go, make sure your baffles are in good shape, the main ways to remove heat is air over the cylinder fins, air over the oil tank, fuel ( rich mixture). Oil will get thinner as it warms up, but Continental recommends what oil to use, a 50W oil is normal. Continental says a engine over a certain number of years since overhaul is due for overhaul, but as a private operator you are not bound to that, as long as the engine meets it's TCDS specs for RPM, Oil pressure, Oil temp, compression and oil consumption, you are free to operate it as long as it continues to do so.

Hi everyone, sorry I haven't gotten around to responding sooner. Here's some more information.
The engine has had a top end overhaul back in 2019 and The compression in the last annual were all mid 70's.

I've got about 15 more hours left on the oil in the engine so next oil change ill do an analysis.

Anyway i would like to continue with this engine for as long as possible so Would installing an oil cooler make sense to keep the temperature low to maintain that higher oil pressure?

What about the oil filter stc?

Or running thicker oil? 

Thanks in advance!

You will need to get compression test results before you know anything. TBO is 12 years so you are decades behind this. I imagine it leaks a lot due ti the old gaskets. I would at least, tear down, check for corrosion, magnflix the crank and put in new rings, reseal it. Find an a and p friend to oversee all the work.

Oil pressure is created by two gears on the accessory case. They get old, worn, and sloppy
resulting in low oil pressure. My 75 hp engine ran
for many years at 22 psi on warm summer days.
Flew ok and didn't seem to hurt the engine. Cure is
a good used accessory case and gears as they are
probably not repairable.

www.manualslib.com/manual/1960161/Contin....html?page=12#manual

This link is to the continental Motors A Series Operator's Manual. Page 12 has the operating limitations. 30-35 psi in cruise is acceptable. 10 psi when idling…

If it’s still making power, has good compression, and isn’t making metal. FLY IT!

BTW sending an oil sample out for analysis is always a good idea.