Audi a4 b8 avant rumbilng sound

[FlameZY]

Hey guys, can someone help me.. When I startup my car and its cold I can hear a rumbling sound around my engine plus it smokes white alot and I cant delfine the smell of the smoke.. I have to replace the thermostat cuz it dont work but it still borhers me what it is.. Also no got not lights on my dashboard.. 

[Steve Q]

White smoke could be a sign of a failing head gasket. Is it using coolant?

Or an issue with the egr 

[FlameZY]

It doesnt... i havent filled it in for quite some time now

[Magnet]

Diesel or petrol? 
Colour of smoke? 

[FlameZY]

18 hours ago, Magnet said:

Diesel or petrol? 
Colour of smoke? 

Diesel, white but no specific smell

[Magnet]

Take the car on at least a 10 mile run, then without switching the engine off, get an assistant to increase the revs. and hold it at a steady 2000rpm for 2 mins, while you observe the exhaust smoke - then report back.