Whether you own a brand-new car or a vintage vehicle, eventually your vehicle will need a tune-up. After driving for some time, filters get dirty, and engine oil gets old. To keep your car in tip-top condition, you should take it to a car repair shop for a tune-up. Otherwise, it may not run right.

While sometimes your car may show obvious signs that indicate it needs a tune-up, most of the time, it won't show any signs until it breaks down. So how do you tell that it's time for a tune-up? Below are four indicators that you should watch out for.

1. Decreased gas mileage

Decreased fuel efficiency is a major indicator that your car needs maintenance or repairs. There are several issues that may cause a decrease in your MPGs, including a dirty air filter, exhaust leakage, a failing oxygen sensor, clogged fuel injectors, and a defective thermostat. If you note that you're making more trips to the gas station than usual, you should try and adjust your driving habits and visit an auto repair shop for a tune-up.

2. Some dashboard warning lights come on

If you turn your car on and some icons you don't normally see appear on your dashboard, something is wrong. While you may be tempted to ignore them, the issue can quickly become a serious problem if you don't take your car to an auto repair shop. Therefore, even if your car drives fine, check the manual to find out what the warning lights mean, then call a car specialist.

3. Strange engine noises

Whether it's a roar or a gentle hum, your engine produces a unique sound after ignition. You're most likely accustomed to the sound, and it can be unsettling if you hear a different one. Whether it's a grinding, squealing, or knocking sound, if you hear a weird noise, take your car to a car repair shop for immediate inspection.

4. Black engine oil

Oil is the lifeblood of your engine. It helps to lubricate the moving parts and prevent wear and tear. Because engines have parts that rub together and create heat, your engine oil should be able to flow through them and absorb the heat to prevent overheating. While oil that is in good condition can help to prevent overheating, old oil doesn't. Therefore, ensure that you inspect the condition of your engine oil regularly. If it has a black color, you should visit a car repair shop for an oil change.

If you note one or more of the indicators mentioned above, ensure that you get in touch with a trusted auto repair shop for a tune-up.