first time posting so be nice! just bought my bmw 320 d tourning estate yesterday 2003 model privately. started my 200 mile journey home and was having a great time, car on cruise control set at 70 miles an hour(never owned a car with cruise control) . the journey was flying by on my leather heated seats(also never had) when me and my mother who was following me back decided to stop in a toby restaurant and fill up on a bit of grub. when i got back in the car and started to drive off it started to plume white smoke behind which got worse as i accelerated i pulled over and it still smoked when idling . so i phoned the guy purchased the car off and he reassured me it wasn't like that before(maybe i'd been tricked?) .so i was far from home no aa/rac (doh!) i thought drive on home, a minute or so later the smoke had completly gone and didn't come back the whole journey. this morning i drove it up the shop and back nothing. then fifteen minutes later i took my son to school and the white smoke was back and again it cleared after a minute ,the yellow radiator picture light now comes on . my mate seems to think its nothing serious and will have a look at it he said perhags egr(think thats what he called it) so im going over his house tonight to change oil filter,fuel filter, new oil (should do with any used car when first purchased apparently) . anyone got any ideas or experience of this problem which will surely got me a ticket off pc plod should he be unlucky enough to be behind my 007 smoke machine