Reliability Mods For Engine?
 

What should i do or replace to ensure my lovely vehicle runs as long as possible.

Bosch fuel filter?
O2 Sensor?
Aftermarket Radiator?

sure. also, clean your injectors and replace all the old brittle vacuum lines.

Fuel Filter, 02 Sensor, Spark plugs+wires, Oil, Oil filter, new belts, New radiator if the OEM one is not functional (aint broke, dont fix it) New fluids in every fluidized area possible.(master cylinders, transmission, rear end)

Replace all drive train parts (wheel bearings, brakes, suspension)

Rebuild engine o.0?

Im saving for a rebuild but just doing maintenance for now. Anybody know where a how to is for cleaning injectors? Also do spark plug wires (so called performance wires) such as the Racing Beat do anything?

Thanks

I work at a Firestone, and we have a injector cleaner that works okay.
It will run a bit funny for about a week or so after the cleaning, but after that Ive notice a huge difference in smoothness.
It revs beautifully now.

.02

Just have an injection shop clean and flow test them for the time and money its worth it plus its cheap

Check all of your OMP lines make sure they aren't brittle and that oil is flowing through them. I like to mix in 2 stroke oil in my gas just for added protection.

I hear that the S4 OMP never fails so 2 stroke probably isn't necessary but it makes me feel better when I'm into the gas.

witchhunter.com foo! they will clean your injs. and sent you a nice pretty flow chart as mentioned above.. plus it was like 70 bucks for all 4 of mine back in the day..dont know if they've raised their prices since then