depends on mileage if more than 100k
replace all belts
timing belt
tensioner bearing
water pump
radiator hoses
fuel filter
pcv valve
use 10-40 API-SG/SJ oil
Pressure test cooling system (radiator, water body etc)
use coolant instead of water.
remove any relays or wiring jugaads
test alternator and ignition system (plug wires, distributor o-ring leaks, spark plugs etc.)