Does your service department work on BMWs not purchased at your location with a separate warranty? Reason for asking is I have recently bought a 2004 325ci and I’m having a misfire in cylinder 5 and want it looked at by a BMW mechanic

Sorry was supposed to say 325ci

They didnt make 335i until 2007 and they never made a 335 with ci badge. If your having misfire in cylinder its definitely spark plug, ignition coil, or injector. Swap coil 6 with coil 5 is misfire changes to 6 than it's a coil if not change the plug in 5 if that doesnt fix it than it's a injector. But ima guess they wont accept the warranty cause that car doesnt technically exsist, and if its 3rd party warranty you need to talk to warranty provider first.