Lycoming
I have had great longivity with 0-320.
3,500 hours on a PA23 (Apache).
I am currently at 3000 hours on the engine in my RV4.
This engine began its life in a Piper, in 1969.
It was removed in 1975 with 2000 hours.
It is believed to have been topped at that time, but no records could be found.
The engine then sat for many years, in unheated garages and hangers in the Denver,CO area.
In 2010, (after sitting for 35 years) I hung it on my RV4, with hopes it would run for 40 hours to fly off testing time.
It is now 2019, it has 3000 hours, and the old thing is still purring along.
The engine compression has, always been high, (78 for the lowest),
Oil pressure steady, and oil consumption zero. I never have to add oil and do changes between 30 and 50 hours.
I use Phillips X/C and Camguard. Oil analysis is done on all oil changes.
Oil filter is always opened and scoped.
If temp is below 40F, I pre-heat.
I plan on running this engine until it shows some sign of weakening.
I have also run an 0-235 L2C to 3500 hours without any replacements.
If I were running your engine, I would treat it as I have described, use Camguard, have the oil analysed and always cut open the filter.
Happy flying.
Joel
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