E90 E91 N52 Serp belt, tensioner and idler replacement. VANOS non return valve cleaning. | ‘85

Double feature vid--I replace the serpentine belt, tensioner, and idler on my wife's 2011 328xi wagon and also clean the Vanos oil non return valves to try to solve an intermittent rough idle.

[@wzrdjorge]

that 90 degree after is scary