There is the debate of carbon build up, in theory some people will argue that carbon build up is a byproduct of more oil. Carbon build up is an issue in the dome of the cylinder head, in which it does two things
-creates a higher compression ratio the more it builds up, which leads to pre-ignition
-parts of the carbon build up can heat up and turn cherry red causing pre ignition.
If you have ever seen a chainsaw piston that has small dents and chunks missing around the top outer circumference this is probably why it happened.
You might now be asking how long this takes, well I’ll give you my own personal experience on that.
I run 32:1 and was using maxima k2 2 stroke oil. After one year I disassembled both my 550xp and 372xp, both of which were run off and on throughout the year. On both saws there was a small 1/2x1/2” patch of carbon up near the spark plug. Nothing really to write home about or worry about IMO.
No matter what people say there are saws that have been run equally long on 50:1 and 32:1.
However my preference is that more oil is better in which I think that a saw will last longer and can take more heated abuse on 32:1
Carbon build up is also unavoidable no matter what oil you use, at some point in the saws life you will have to manage it. This requires a tear down and cleaning of the cylinder head.
IMO carbon is much better controlled using the canned fuels rather than pump gas. If you want more oil, just add it to the can accordingly. This is much more expensive however
I hope that answers your question outdoorliving