Pennzoil specifically warns against using different oil weights -- the number following the dash -- in your car's engine.

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 of engine oil. These oils are designed to lubricate an ...

One Tacoma owner ditched Toyota’s recommended oil for something thicker, and the results have sparked a heated debate. Is ...

Oils do more than just lubricate our cars’ engines—they help protect all the internal components and keep the powertrain ...