What's out of sight is often out of mind. Which means even the most experienced riders forget to top off their engine oil once in a while. Refer to your snowmobile owner's manual and fill to the appropriate level. Depending on your storage situation, a snowmobile can accumulate dust, debris and moisture during the off-season. Clean and check all fittings, pivots and cables to ensure they are properly lubricated. Add and adjust lubricnts as needed on rear suspension, front suspension, steering components, as well as your chaincase.