burning

Hello all, For the last week I have been smelling a burning smell with no visible smoke. It only occurs after the engine is warmed up and I have the heater pulling in air from the outside. I can't tell if its oil or something else but it coincidentally started to get noticeable after an oil...

So this burning smell happens in first gear when hard acceleration at light or merging into traffic. When it happens its within the first 5 minutes I have the car on. You guys think its the clutch, underbody coating (stock), or some other thing? Also while you are here, any tips on smoothish...