I’m one of those who bought a former rental class C - a 2004 in 2008 wth 70 000 km. Everything worked then and its still working. In 2019 I got thinking it is probably at the half way point in our use so I took it to a garage for the first time and got the serpentine belt replaced. This year I took it to the same local garage for coolant, transmission and rear end fluids changes. Also, the dreaded spark plugs. It’s at 120,000 km. I asked around for a mechanic that had experience with Triton engine spark plugs. I said we won’t need it until spring so the work is proceeding slowly as it is the busiest garage in town and it has been a tough winter here near where the Alaska Highway begins. The spark plugs are replaced with no problems.