|
The N54 needs it every 60-75k, it starts running rough and misfired a touch at cold idle. It isn't something that will leave you on the side of the road, just a gradual performance degrade. Walnut blasting is $500. The N55 is less sensitive, and a much less maintenance needy option in general. 2011 on 135i is the way to go.
__________________
Josh (PA) -
'19 X5
'17 991.2 C2 Cab
'11 135i Convertible
'11 328xiT
'09 X3
|