Why does my car sound like it has an exaust after getting an oil change?

If your car sounds louder or has a more noticeable exhaust noise after an oil change, it could be due to a few reasons. First, a mechanic may have inadvertently left a component loose or improperly reattached, such as the heat shield or exhaust pipe. Additionally, if the oil filter was replaced, any residual oil on the exhaust components could create a burning smell or sound as it heats up. Lastly, if you switched to a different type of oil, it could affect engine noise, although this is less common.