No, Charlie, actually I was using a different Exxon synthetic.  But, no, not
any sign of lead build up.  Perhaps without valves to catch the lead and
with less access of oil to the combustion area perhaps? the rotary is less
susceptible to the problem.  However, having found that Mobile is being sued
due to damaged aircraft engines from folks who used their aviation
synthetic, I may have to reconsider.

Ed

Ed, While I don't totally discount that there could be some (MINOR) problems. I would remind you that McDonalds was sued by some idiot that spilled hot coffee in their own lap! Just because it's litigated don't necessarily mean that it's true!

Bill Jepson ( just my opinion, so DON'T sue me)