Greetings everyone-

I spent some time this morning on the phone with NGK headquarters discussing the proper spark plug for the BMW x5 (all engines).

The answer is NGK BKR6EQUP

They specifically do not recommend the bkr6eix as it is in their words- an inferior plug and fouls more often, and needs to be replaced no longer than every 20k miles.

The BKR6EQUP has a stronger electrode , comes gapped correctly at .032 and will last longer with better results all around.

By the way- if you see the #3199 before or after the NGK or BKR6EQUP, that number is simply a stock number used by the auto parts stores.