dh pilot is on the money IMHO. It's the private aircraft that sit around and do little if any flying that are at high risk, due to internal corrosion and seals/hoses drying out.
Other issue that annoys me, is that there is no way I as a private hirer can determine if an engine is on condition or not, without asking the LAME or owner. The MR should clearly state if the engine/s are on condition. I have addressed this issue with CASA which went on deaf ears.....