Guys, how do you comment this - 2006 BMW 525i Direct Ignition Coil
From 4/2006, Bosch and Delphi coils should not be mixed in the same engine. If all coils are being replaced, either brand can be used?
It's a rule of thumb to not mix ignition coils in the same engine. Here is an example: if you are replacing a few coils and the brand installed currently is Bosch you should replace the bad coils with Bosch leaving all Bosch coils in the engine. You should not mix and match coil brand manufacturers. If you're installing or replacing all the coils in the engine you can install either brand.