I'm looking at another used machine being offered locally. It's a 2006 Bigfoot with 553 hours on it. Is that a reasonable amount? I know there are other considerations as well, but I just don't want to get too excited if the engines are only good for a certain hour count. I do realize that an B&S 18 replacement should be easy to source. My only experience with smaller twins are the ones in my motorcycles, and I fully expect those two liquid cooled twins to last as long as a car engine. My Snowdog has a 13.5 B&S, and I'm crazy obsessive about the maintenance. I would plan on being the same with an Argo. The seller has a $5k asking price, I just want to have my due diligence done beforehand. Thanks.