When you’re shopping for a used vehicle, you might have an option to buy a used car warranty. But what exactly does a used car warranty cover? To figure out what your warranty might cover, first see if a manufacturer’s warranty still exists and is transferrable, or if an extended warranty is available. And be sure to tally up the potential costs before you sign a contract.

Every automobile engine needs an oil, but not just any oil will do. Modern engines are designed and built to exacting standards and require oils that meet very specific industry and automaker specifications to ensure long service life.

Depending on vehicle age, type of oil, and driving conditions, oil change intervals will vary. It used to be normal to change the oil every 3,000 miles, but with modern lubricants, most engines today have recommended oil change intervals of 5,000 to 7,500 miles.

The ideal time is when they’re ‘cold’—first thing in the morning or a few hours after the vehicle has been parked (in the shade, possible). If your tires are warm from driving, you’ll get a less accurate reading.

The best practice is to check your inflation levels once a month. To help make this a habit, some drivers check their tire pressure every time they fill up gas. If your tire is hot, never lower the pressure to recommended PSI; as the tire cools, the pressure level will decrease.

This common maintenance task—which should typically be done every 5,000 to 8,000 miles—isn’t one you should ignore. It may seem minor, but remember well-maintained tires will help you travel safely for thousands of miles.