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

So your car’s oil pressure gauge is behaving like a metronome or, worse yet, has flatlined altogether and you want to check the pressure manually? Wunderbar. Your engine’s oil pressure is vital to its ...

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 ...

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 ...

To understand how overfilling your engine oil is too much of a good thing, it’s helpful to provide a little background. Engines are comprised of hundreds of precision-crafted parts working in unison ...

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 ...

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 ...

We may receive a commission on purchases made from links. If you've worked with cars for a while or have owned a few, you probably know that different vehicles use different types and classifications ...

Your engine’s oil pressure is one of those things that needs to be just right. If it’s too high or too low, it can be indicative of other problems. This is especially true with high oil pressure, as ...

Many enthusiasts look to diesel motor oil as a high-zinc alternative, but is it the best choice? A certified lubrication expert explains the difference. It is widely known that diesel engine oils ...