Inspection time and we have the exhaust stacks and shrouds off giving a good look at the carb, intake, alternate air intake and oil cooler. The intake tubes run through the oil pan heating them and the carb for some prevention of intake ice, and also for packaging. Lycoming O-540, 540ci horizontally opposed, air and oil cooled 6 cyl, 235hp in this configuration w/ a constant speed prop controlled using the engine's pressurized oil supply. She has ~150hrs since overhaul. Though some would find this interesting. For the important stuff here; Phillips XC 20w-50 and Tempest (small internal magnet) (or Champion) oil filters.