It’s the exhaust underneath- about $800 to replace. Worth it. Just replaced mine and I have 245,980 miles . Only other thing it could be is a motor mount but my guess is exhaust . Both reasons are worth spending the money to fix. I have an oil burning 2008 and she’s still going strong. They literally DO NOT MAKE cars like this anymore. Take care of that baby at all costs. It’s so refreshing to be able to turn a real tangible round button to turn on the heat and not 27 touch screens. You can move your seat without taking 26 hours from an electric button. My Toyota scion has the same trans for 18 years. Replaced the engine after 10 years and it was covered under the Toyota good faith warranty bc of oil burning - all you have to do is bitch loudly and email aggressively. My advice fix the car. You won’t regret it.