Thanks youngsyp and oilman for the information. My reasoning for letting the car idle was to let the oil pressure drop slightly before driving however as I now understand there is no need!
youngsyp- you made a very good point about the gearbox, transfer box and rear diff oil not getting upto temp when the car is stationary. I have always allowed for this and driven conservatively so as not to stress any part of the car when driving from cold.
oilman- by oil temp has never been over 120deg and that was on a mild day, as youngsyp has mentioned I may think about changing the oil I use for something more suitable for the temperatures my oil usually operates within...
youngsyp- you made a very good point about the gearbox, transfer box and rear diff oil not getting upto temp when the car is stationary. I have always allowed for this and driven conservatively so as not to stress any part of the car when driving from cold.
oilman- by oil temp has never been over 120deg and that was on a mild day, as youngsyp has mentioned I may think about changing the oil I use for something more suitable for the temperatures my oil usually operates within...