We all know that nothing last forever but if you want your vehicle to last for any amount of time, regular maintenance is a most. Regular oil changes insure against engine sludge. Sludge can cause an array of issues, starting from minor annoyances like a drop in fuel efficiency to major problems such as overheating and increased engine noise. In worst-case scenarios, it can result in complete engine failure, necessitating costly repairs or even a full engine replacement. For vehicles that are either all-wheel drive or four wheel require special attention to tire wear and transfer case fluid. Uneven tire wear can cause issues with transfer cases in addition to uneven tire wear can cause significant noise, vibration, handing, and traction issues in all vehicles. The general recommendation is to replace the transfer case fluid every 30,000 to 60,000 miles.