I have a 1975 P337G with A.C., Riley intercoolers, spoilers etc. Engines are TSIO-360 CB and I fly it between 250 and 350 hours per year. Almost 900 hours over TBO, 2300 hours on both engines. Compressions still good. Oil always changed between 25 and 50 hours. I tend to operate ROP. Changed some accessories such as turbo charger on each engine, alt, starters. Engines still Run good...will keep flying it.
Jerry
N34EC
