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

Renault and Castrol have partnered to introduce a co-branded range of premium engine oils made with recycled base stocks. The ...

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 ...

Car engines have used motor oil for the whole of automotive history, and during that time a lot of myths have cropped up ...

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 ...

It doesn't matter if you have a hybrid or conventional gas-powered car, a good motor oil can make the difference between a long-lasting engine and a sputtery ride. Here's what you should look for when ...

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 ...

The oil you put in your engine matters. After all, your engine contains many moving parts that must remain lubricated to work properly. Otherwise, your engine could develop some serious wear and tear.

My brother has a 5.0 small-block Ford in his 1949 Ford. The engine came from a police car and it was equipped with an oil cooler. We both live in Arizona and even on the hottest days his car never ...

Love racing, but not a fan of the sport's carbon footprint? Idemitsu is hoping to bring that down a notch with its new Plantech Racing engine oil, which uses plant-based raw materials for more than 80 ...

From a new V3 Honda engine to Toyota’s latest Hilux, these are the biggest stories in car news today.