Analyzing the oil in your vehicle is like sending your blood to the lab for tests. An engine oil analysis can provide clues about the health of your engine – without any invasive surgery. By analyzing ...

Here are 2025's most popular questions and answers from The Journal's Car Doctor column, from rotating tires to oil changes.

Motor oil is the lifeblood of your car's engine. Not only does it provide lubrication for all of your engine's internal moving parts — of which there are massive amounts — but it also works like a ...

Do you often find that your oil level is lower than you expect when you check it, or do you get a lot of grief from the tech at the oil change shop about your oil change intervals? If so, your engine ...

Car diagnostic tests scan a car’s components and integrated systems for errors or malfunctions before they become dangerous. These tests leverage computerization to keep your car in optimal working ...

Choosing the right motor oil is paramount to car maintenance. It's not a particularly exciting task, whether shopping for or changing your oil, but if you don't pay the proper attention, then you aren ...

An oil change is a great starter task for anyone learning about car maintenance, but picking the right oil for the engine to is just as important as technique, especially when faced with deciding ...