IIRC, thy won't warranty it free if used in larger vehicles, but if you pay the $50, you can send in a pile of ash and they will take care of you. Either way, contact them, be honest, and see what they say...
Ideally I wanted a MMM but I couldn't afford it and since the MM did fine for me I kept running it. I put a fan on in when it started heating up more(probly due to a tired cap???). I'll call them up and tell them my story. And whats this abotu a refurbed MMM for only $100??? Where?