High Detergent? High Definition? Howdy Doody? Just what, exactly, does it mean when the label on your vehicle's motor oil ...

A crash off the Yorkshire coast involving an oil tanker which has released fuel into the sea has caused immediate worry for ...

But there are other notations worth paying attention to on the labels of even the best motor oil brands, and the letters "HD" rank among the most important. Those letters can often be found ...