Hi. i owned a 2012 sdv6 with 140.000km . I have problem with power loss on long trips , when the car tripping for 1h or more, at speeds between 150-170 km/h the car lose power and then let me travel only at 100-110 km/h . No check engine light on dash and no errors in ecu . After restart works fine and do it again .... the car works fine under the 120 km/h. the car has only a after market k&n air filter.