I just had the 30k miles service done on my car this past week.The eingine oil, tranny oil, rear end oil and spark plugs were changed. I talked to the tech that worked on my car and he told me that the spark plugs should be changed every 30k miles.
'09 E92 ///M3 Interlagos Blue, 6MT
, Silver Novillo Leather, CF Trim, Premium Package, Technology Package, Cold Weather Package, Premium Sound, 19" Wheels, Moonroof-Toy/ '11 E90 328i
Black Saphire Metallic, Premium Package, Technology Package - Daily Driver '02 Nissan Xterra- Daily Driver/ '04 Yamaha R1
-Toy/ '06 Yamaha Raptor 350