I think its just mechanical sympathy, disconnecting the drive when its not needed, when sitting in traffic for any length of time. Just a simple matter of knocking it into "D" when its time to move again. Landrover - turning owners into mechanics since 1948

2014 Orkney grey Freelander SD4 GS.
2004 Zambezi silver Discovery 2 Td5 (Gone)
1963 Surf blue Morris Mini Minor Super de Luxe (my little toy)