My Brothers dodge avenger runs great but when I pull up at a stop light it starts smoking Im losing no water leaking some oil pretty bad under neath the car it seems to run fine and not smoke until I run it a while then it starts smoking any clues would be appreciated.158,000 miles also and white smoke.

White smoke is bad. More than likely you have a blown head gasket or lower intake manifold gasket.

My Brothers dodge avenger runs great but when I pull up at a stop light it starts smoking Im losing no water leaking some oil pretty bad under neath the car it seems to run fine and not smoke until I run it a while then it starts smoking any clues would be appreciated.158,000 miles also and white smoke.
White smoke would indicate coolant leaking into the engines combustion chamber. Is it only white no blue at all? Does it have a strange smell? I assume you know what burning oil smells like but it will help to diagnose the problem. If you are burning coolant it will eventually go down and depending on where the leak is and what kind of leak you have you may even get some oil in the coolant or vice versa. You should clean the engine up good and then find all leaks you can. Find that oil leak, if it has the V6 engine and is leaking oil from the oil pan because it is rusted out I have a replacement oil pan I could sell you.