I'm pretty sure every vintage Harley manual states "if it stops leaking oil, you're out of oil"Yeah just about every car i've owned used oil and leaked oil, which to me if its leaking oil, means it has oil LOL. But in all seriousness, I dont think this car uses much oil, the engine allegedly when swapped had about 80k on it, and the engine is really healthy, as for Exhaust color, it doesnt smoke at all except when its cold, which is to be expected.
My '78 has a dedicated cardboard sheet that lives under it.