about 150hr,I changed plugs at 100hr.they were leaded up but were firing
ok.On the oil part of lead,I havn't had the same problem.Maybe-becaues
I changed oil more often.(My plane is one of the Caldwell,Id builders group.

wrote:
LJ,

How many hours do you have on your Rotax? I've heard that running
100LL requires more frequent oil, filter, and spark plug changes. What
is your experience? So far, I've been avoiding avgas, and have managed
to run mine 120 hours on mogas exclusively.
tom