Ahhhhh.... what about the engines?

[GMAs]

if you wait 12 years I can garentee you that the oil cooler will be full of carbon... if you use it or not... sure it will still be working but, not much in the way of effecency....

if your using it part 135 your placing more than 1400 hrs on it every 5 years... else its just sitting around all the time building carbon up and plugging the cooler... again we use 5 years to clean them out... its not that expensive and like insurance ... good to know ... however, some people place more bets on their attry than the insurance... but, then again they get to change planes and start over every so often.. smile...

Again 12 years or 1400 hrs... that is the suggested max time allowed... how many of you are runing around with ones that are 20 years old and never been serviced... Hmmmmm

GMAs...