Just think of it this way. At 5k miles, your oil is already dirty and full of contaminates. Why would you want to keep driving with that oil for another 5k miles? Sure, the manual will say each oil change at 10k miles is required but if I want my car to last beyond 200k miles, I would take the extra precautions and change it sooner at every 5-6k miles.
Pros: extra precautions, longer engine life
Cons: oil is dirty at 5k miles
Vehicle:
Toyota Camry
