Mxsmanic wrote:
The engine itself usually seems to be covered in grime, unless it's
brand new. I find that to be a major turn-off.

Have a look at some owner-maintained aircraft. My engine, and the
engines of most friends I have who own their own airplanes, are almost
spotless, and none are new. If you don't keep them clean, how can you
see if there are new leaks or anything out of the ordinary?

Shirl