Engine oil seems so simple. It's slippery. It keeps metal parts from fusing together. It's messy, especially when it has been squeezed, slung, and sprayed around the inside of a hot engine for ...

Let's talk about Zinc. When we say Zinc in reference to motor oil, we are actually referring to the compound Zinc DialkylDithioPhosphates. That's hard to say or spell, so we just call it Zinc or ZDDP.

Q:For a while all I heard was how using oil with reduced zinc would destroy an engine equipped with a flat tappet cam, but the controversy seems to have died down. I'm about to put my dad's 1955 ...