What are some common issues to check for in a Ford Focus engine?

I recently purchased a used Ford Focus and I want to make sure I am taking care of the engine properly. What are some key things to check for and maintain in the engine? Any signs or symptoms I should be aware of?

As a certified Ford mechanic, I recommend regularly checking the oil level and quality, as well as checking for any strange noises or smells. Also, keep an eye on the engine temperature and make sure to follow the recommended maintenance schedule for things like spark plug and fuel filter replacements.

Don't forget to also check the air filter and make sure it is clean and functioning properly. You should also keep an eye on the fuel consumption, as a sudden increase could indicate an issue with the engine.

As a long-time Ford Focus owner, I can say that one common issue to watch out for is transmission problems. Make sure to have the transmission fluid checked regularly and if you notice any shifting issues or strange noises, take it to a mechanic immediately.