smokin/burnin problem

I wrote in here a little while back sayying my car was smelling...more like an oil burning smell. Well, its a 1994 camry 2.2l xle and I just had my radiator replaced almost a little over a week ago. So I finally took it to the mechanic who also said he smelled it after I shut it off. I explained to him that after driving it for about 20 minutes and turning it off it started smoking a little bit, coming from what looked like under the exhaust manifold. He looked around and went under the car and said the exhaust looked clean and he couldn't figure out where the smell or the smoke (it wasnt smoking at this point) was coming from. He simply said to drive it for a couple of days and he would see how it handles. He is thinking that something is still burning off from when they did the radiator repair a little over a week ago....should I worry...should I even drive it? Last thing I want to do is make it worse. Anybody have any suggestions?

nevermind, it was just the drain plug....small things can make a car go bad sometimes but its fixed

I have this same problem, only happens sometimes and seems to be coming from under the exhaust manifold. But I can't see any oil. My drain plug is fine.