Oil changes are vital maintenance, but bad oil can seriously damage a good engine. Here's how to guarantee you feed your ride only the best.

We all have a stash of old oil bottles sitting on a shelf in the garage. Most car guys think that engine oil has an unlimited shelf life, but the reality is that just like the milk in your ...

Whether we're talking about the 20-year-old Valvoline oil or the 50-year-old Mobil1, both showed significant signs of oxidation, shaken or not.