If a gasket is required, have it in writing. Some states allow for silicon to be used instead of gasket. Silicon holds up for maybe 6 months and breaks down.
As for the Honda, good news! My husbands cousins husband worked for Honda dealerships throughout the US. He says that the engine should last 300,000 miles!
We have a Honda Pilot at 100,000 and she is a 2006. So, hold on to a good vehicle.