How often should be changed the spark plugs on a Audi A4 1.8T , years/milage ?

Is it necessary to change the air filter too everytime i do an oil change or no ?

 

i think plugs need changing every 80,000 km (50,000 miles) or so. be sure to use the OEM plugs.

how often do you change your oil (milage)? if you do it every 8000 km (5000 miles) like i do, then no you don't need to change the air filter. if you change the oil at twice the milage, then i would replace the air filter.