At around 20k miles, there are several other things you can check in your car to ensure it's running smoothly and prevent any potential issues down the line. Here are some suggestions:

1. Check your tire pressure and tread depth: Proper tire pressure and tread depth are important for maintaining traction and handling, and can also affect your fuel efficiency. Use a tire pressure gauge to check your tire pressure, and make sure your tires are properly inflated according to your vehicle's specifications. You can also check your tire tread depth by using a tread depth gauge or the penny test.
2. Inspect your belts and hoses: Your car's belts and hoses are essential for powering various systems and components, including the alternator, power steering, and cooling system. Inspect them for signs of wear, cracking, or other damage, and replace them if necessary.
3. Change your engine air filter: A dirty or clogged air filter can reduce your car's performance and fuel efficiency. Check your air filter and replace it if it's dirty or clogged.
4. Check your fluid levels: Make sure your engine oil, coolant, brake fluid, and other fluids are at the proper levels. Low or dirty fluid levels can cause damage to your car's systems and components, so it's important to keep them topped off and clean.
5. Perform a general visual inspection: Take a few minutes to inspect your car's exterior and interior for any signs of damage or wear. Look for scratches, dents, or other damage to the body, and check the seats, dashboard, and other interior components for any signs of wear or damage.
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