1995 300ZX AT N/A @ 194K mi still running smooth should I? on 1995 Nissan 300ZX

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.

by in Saint Petersburg, FL on September 27, 2009
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2 answers
ANSWER by , September 27, 2009
I change the differential oil antifreeze and gearbox oil ever 30,000 miles and the brake fluid once a year or at least every second year. The "on the car fuel injection system cleaners" do a good job. If you have no idling problems or State emission test failure a couple of bottles of techrolene in the gas tank may be no harm. Change the fuel filter as well. Remove the air intake boot and clean the throttle body.
ANSWER by , February 25, 2010
these boxes prefer synthetic oil, i would drain the auto and change the filter , the best replacement oil is redline high temp auto trans fluid, at worst it will last much longer. all the n32 z300 i owned were using this fluid , coolant was 75% distilled water 25% coolant and a bottle of redline water wetter, that dropped the temp about 15 degrees on average, i agree with ngk plugs , i usedn iridium rather than platinum, i used castrol synthetic diff oil , i had no problems over 2 cars and 5 years use.