Amplifier maintenance for beginners

Sorry - I was thinking about using synthetic oil.

OK, One more tip - if the voices don't sound centered from the speakers, ensure you have equal tire pressure all around.

Change the oil every 6,000 miles, and rotate the tires every 10,000. Check the timing belt for cracks once or twice a year.
Seriously - amps fall into the "if it ain't broke, don't fix it catagory. Yes, there's contact cleaner for the RCA's, but plugging and unplugging cable once or twice essentially does the same thing.
If you'll become as obsessive as the typical audiophile you'll be swapping cables a bunch, so you'll keep the contacts clean anyway.