I've had a quick look and couldn't find anything that could help me out here.

I bought my car from a used car dealer, which was probably my first mistake. :angry:

I've encountered a problem with the car, which is the car shudders when I'm making a wide turn, but only happens when the car and engine is warm. Never happens when its cold. I've had a mechanic drive it whilst it was warm and told me that the gearbox was damaged and bits of it had gone into the diff.

So I've brought it back to the dealer since its within warranty and they've given it back to me after a day saying there was nothing wrong with it. I told them it was a gearbox issue and that it only occurs when it's warm, but obviously they've tested it when it was cold.

What avenues do I have in this instance? I've been told to lodge a complaint to the appropriate body (whoever they are), but I'd rather just have the car fixed and be done with. How can I prove to the dealer that the car is in fact faulty.

Also a side note, the mechanic checked the gearbox/diff oil and noted that the oil had been changed recently, and he reckons that someones noticed this and changed the oil thinking it would solve the problem.