air filters, fuel filters, cabin filters, at filters, oil filters for a 98 e320 you can buy either autohausaz.com , mercedesshop.com , or any other site that sells mercedes parts. don';t forget to get the fleece one. oil can be purchased at any autostore in town. atf can be bought at the dealer, along with the at filter kit. all together is a little over / around $100. or you can buy it from the websites, as long as is the mb fluid for 722.6. with your mileage, your car probably needs it.