I have a 1992 Chevy 3.1 L. It has 120,000 miles on it. It runs strong! How do i keep it up?

I got it 6 months ago. since then i have changed the wires and spark plugs and the coils. What are some things I can do to improve the performance?I have a 1992 Chevy 3.1 L. It has 120,000 miles on it. It runs strong! How do i keep it up?
Run some synthetic oil in it or do your own mix of synthetic and conventional oils. I do the two quarts pure synthetic, (either Meijer or WalMart brand oil) and three to three and 1/2 quarts conventional and change it once a year or more oftne if the oil looks black/dirty.



Flush out your cooling system every two to three years and use distilled water mixed with antifreeze as this water will not plug up the radiator with mineral deposits like tap water.



Use some STP fuel additive in the winter months to keep the moisture in the fuel suspended.



Change you air filter every two years and inspect it once a year and knock out the bugs and dirt.



Clean the throttle body every two years to keep the sludge from building up in the throat.



Drain and fill your powersteering fluid every two years. This reduces the amount of metal in the fluid to keep the rack and pump in good working order and the seals as well.



Inspect/clean your brakes every year or two and make sure they are not worn beyond spec's and the pads/shoes are not dragging on the rotors or drums. Also, bleed your brakes every two years.



If there are any grease fittings on the steering linkage make sure you lube these every six months minimum.



Drain and fill your transmission every two years and use an aftermarket automatic transmission anit-wear additive like the Slick 50 brand stuff or the blue stuff they sell at AutoZone. This reduces the amount of metal suspended in the fluid and the anti-wear additives work with the fluid to reduce wear and tear inside the tranny.



Good Luck!!