Had a search and couldn't find anything. Discovery 4 3.0 diesel. Mate of mine pulled into a carpark and was engulfed in what he said was white smoke coming out of the exhaust it then went into reduced power mode. He phoned the recovery company and they just took it to he's home, he started it up after a while and it seemed OK so went for a spin and now seems fine. He's got a long journey in a few days and panicking it's going to break down. Any ideas?