Originally Posted by 150flivver
I've heard that once the bugs were worked out, the -H2AD engine is reliable.


Good point. I just helped work on a 172 with the -H2AD engine. It's flown pretty regularly with no issues. The most obvious continuous maintenance is the need for an anti-scuff additive in the engine oil. And I believe AeroShell 15W-50 comes with that additive 'built in'.


-Kirk Wennerstrom
President, Cessna 150-152 Fly-In Foundation
1976 Cessna Cardinal RG N7556V
Hangar D1, Bridgeport, CT KBDR