This post brings to mind a hangar neighbor of mine who has BEAUTIFULLY restored a pre War small airplane called an Aeronca Chief. It has VERY early Lycoming flat four. The cylinders are cast integral with the crankcase halves. No parts, can only bore the cylinders once.

He flies it occasionally and he changes the oil every two months whether it has been started or not for corrosion prevention purposes. Most people at the airport make fun of his oil change regimen, and I ALMOST do, but given the EXTREME rarity and the impossibility of finding parts, I think it's probably overkill, but justified.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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