E30 Zone

i want to give my m20 25 a good service, oil change already done when engine was replaced, new engine had done about 110,000 miles and not sure of its history, what else is most important and should be done with a budget of around 500-600?

Cambelt, tensioner, water pump, all the filters, adjust valve clearances, injector refurb, clean out throttle body and tps switch, replace dizzy cap and rotor arm if worn