if the brake are warped in a short period of time u have a few possibilities: 1) rotors are undersized and for a 160,000 km car, if you haven't changed the rotors at all since the car came from factory, most likely rotors are worn down. get them checked by a local mechanic. if they other mechanic fixed them. he would have machined the rotors. if he has done this, then u would be loosing more meat on your rotors result them warping quicker from the heat generated under braking 2) pads are worn, do u hear a scraping noise when driving (not necessarily under braking)? these would be the squeal shims saying that u need to replace them. check the rears as well. one way to check if they rears are undersized/warped is to pull the handbrake up slowly at 60 to 100km/h speed and see if your car/seat vibrates. if they do, get them checked by the mechanic too NO SHORT CUTS OR CHEAP FIXES, bite the bullet and get them fixed once and properly! u don't want problems occurring again soon after they are fixed also try to change braking habits too and if u braked hard, just get off the brake as soon as the cars standing still and pull up that hand brake. if you got an auto chuck it on "P" As for your oil problem. 3 weeks is definitely too short of a time for the oil to be burning that quickly. its ok to have a bit of soot on the exhaust, that's engine oil + crude oil from fuel burning. I have soot on my exhaust tip as well. engine does consume a bit over time to lubricate the engine. how does the car run? fuel economy? rough, smooth? any tapping noise? black/blue/white smoke coming out of the exhaust. ask eviltwin asked "any oil leaks?" etc.