Use only the NGK oem plugs..... you can get them from AutoZone or similar car parts store for 11.00/plug. 44.00 is much better than the 90.00 at the dealer. I wouldn't even touch Bosch or Champion.... I've seen Bosch plugs die at 30,000 miles (cathode opens). They are garbage. Stick with NGK and you're good for at least 80,000.