Hello, apologies for what I'm sure seems like a very basic question...I'm the new owner of a 1997 Polaris Mangun 425. I just changed the oil for the first time (used Polaris 5w-50) but the oil plug is leaking. (no leaks at filter or prior to my involvement). I tightened the nut to moderate tension, but never gets tight. Do these things usually have a crush washer that might be the difference? Plug just seems too easy to turn.