Should I... Flush/Replace:
1. The transmission fluid?(transmission still shifts smoothly though)
2. The Antifreeze/coolant?(Still operating in normal temp)
3. The diffential fuild?
and last but not the least,should I need to get the fuel injector clean (by the professionals) but I am afraid that once they flush or clean the injector... somehow few months later the injector will die and blame myself for having the injectors cleaned. I have the car for about 2 years now. The only thing I had to replace was the alternator. Currently the car runs and idles smoothly. No slugish during take off and even on highway speed. No knocking or no hesitation. I just wanted to do a preventive maintenance. Oil change is always done every 3000 miles. I also replaced it with NGK Plugs, K&N air filter, Fuel Filter and Brake pads recently. Any suggestion will be greatly appreciated.