Don't forget that on an operator's point of view, the Lycoming o-235-L2c engine's TBO is a whopping 2400 hours and easily reached without problems. As against the 1800hour tbo on the continental-powered c150's. At usd30/hour leaseback, the owner/operator would have earned 18g's more on a 152 than a 150 before they send the engine for overhaul.