The 2006 MINI Cooper runs on premium unleaded (required).
The manufacturer recommends that you use 10W-30 motor oil in your 2006 Mini Cooper. Use in extreme climates may call for a heavier oil, like 10 W40.
I use about 4.25 qt (about 4 L)
Wrong oil filter. Must use OEM oil filter in Mini's. The aftermarket filters dont have the proper check valve inside.
If it is a CVT transmission then yes you can use cvt gearbox oil in a mini cooper.
The 2008 MINI Cooper runs on premium unleaded (required).
The 2002 MINI Cooper runs on premium unleaded (required).
The 2007 MINI Cooper runs on premium unleaded (required).
The 2012 MINI Cooper runs on premium unleaded (required).
The 2004 MINI Cooper runs on premium unleaded (required).
The 2005 MINI Cooper runs on premium unleaded (required).
The 2003 MINI Cooper runs on premium unleaded (required).