As the powerhouse of the Polaris Ranger Full-Size, the engine is kind of a big deal. So when engine parts go haywire, engine temperatures start to skyrocket, and knocking sounds begin to reverberate from under the hood, you can almost feel your wallet shrinking in your pocket. But even before your engine shows any signs of sickness, there are myriad preventative measures that can be taken to extend the life of your Full-Size Polaris Ranger engine and its constituent parts. Obviously, you want to keep the engine oil at appropriate levels and ensure that its not dirty. The air box and its related hoses are also components that need to be monitored religiously. Especially with the Full-Size Ranger 570, you have to clean your air box, put new filters in regularly, and make sure the airbox lid is closed properly. It may even be beneficial to drive a few screws into the airbox lid to make sure it doesn’t slip off at any point on the trail -- because once your engine starts taking in the dirt, its demise becomes increasingly imminent. Alternatively, you could also try installing 3/4" by 1/8" foam tape around the lid to seal the box nice and tight.