I am planning to buy a cessna 150L 1973. It has a new engine 0-200 continental with Crome cylinders) with only 4 hours. The owner is using 87 oct car gas to break it in. I am new to this and i appreciate your comments before i buy the plane. Is it good for the engine to run it with car gas while is broken in ? Should he use 100ll? What about in the future? [color:"blue"] [/color]
I'm fairly certain that the EAA Autofuel STC specifies some amount of leaded gas during the break-in process. Also, most (all?) of the cylinder manufacturers and rebuilders will not honor any warranty on a cylinder that was run on autofuel.
Taken together, the best course of action is to run 100LL until after the cylinder warranty expires and/or break-in occurs, whichever comes last. After that, use autofuel to your heart's (and engine's) content.
