The International Cessna 170 Association

25 recommended with the original screens and up to 50 with an oil filter adapter. Me personally, and with me doing my own oil changes, I shoot for 20 hr changes with the screens. Never let it get to 25. Good time to clean and gap plugs, take a look at valves with the borescope, inspect exhaust, and ...

I’ve been running mogas for the 600 hours that I’ve had my O-300 and valves look great and plugs are always clean. Something to consider: 1800 TBO x 7.5gph x $2.50/gal savings = $33,750 in fuel savings over the life of the engine. Overhaul is more than paid for. Fortunately, there is no ethanol in A...

Looking at the AOPA carb ice chart, the temperature/dew point put the conditions in the “severe icing-glide power” region. Time on the ground in idle could have built up ice to the point of trouble. I get carb icing nearly every time I taxi for takeoff that I clear with 20 seconds of heat during the...