You might also want to run a bottle of Techron through the tank. It is recommended to put a bottle in when you fill up but not more than 2x between oil changes. I like to do a treatment of it right before I change the oil. Put it in at a fill up & then after the next fill up change the oil.
__________________
2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
|