The Comfortmatic gearbox User Manual supplement says that the Hydraulic Clutch Activation Fluid should be changed every 60,000 km or every two years, whichever occurs sooner. Our motorhome is coming up to two years old but has only done 7,000 miles and I wondered how critical is the timing of this oil change and what harm might arise if we delay? Does anyone have knowledge or experience on this? Advice will be appreciated.