Ralph, I also watched that webinar and as you say it is quite good. I am attempting to operate my 912uls "on condition" also. I did my "5 year" rubber replacement at about 7.5 years because I had the engine dismounted for other reasons which made it very convenient to do the rubber at that time. However, I will say that every rubber hose, etc. that I removed was in perfectly good condition, in my opinion, and could have easily lasted until 10 years. I fly at least once per week even thru the winter (few exceptions) and keep my plane hangared.