Problems with Peugeot 307 HDI, Alfa 159 and Clioii

I am new in the forum and I have decided to get to my pots, after not finding mechanics that play it in the place where I live, Rancagua Chile.

The most urgent is a Peugeot 307 HDI, who on the road one day is accelerated alone and shot a great smoke, stop the engine and now turn on but throw a lot of smoke.
He posed an oil change and took him as 7 liters, while the engine makes 3.6L, after the discovered oil analysis containing diesel. The car is standing a year ago.
Please help.
Thank you