Royal Purple's brochure brags about an oil film "3 to 4 times as strong as any comparable lubricant," which means fewer metal‑to‑metal introductions under big load. The same handout states ...

Royal Purple’s BioMax EAL products are suitable for use with marine hydraulic systems and gears, as well as stabilizers, rudders, thrusters, controllable pitch propellers and azipods. “Royal Purple is ...

Royal Purple, Ron Davis Radiator, and TurboSource Inconel Header - Prepping For Boost With a supercharger sitting on the bench, we prep the 8 for even more heat production.

Read about the chemistry behind motor oil from Mark McFann of Royal Purple Motor Oil, only at Chevy High Performance Magazine.

Royal Purple has been around for a long time. But the brand name surely isn’t as well known as, say, Castrol, Repsol or DuPont. The company’s founder was one of the first to develop synthetic ...

The Skeptics Designer‑water jokes and eye-rolls aside, the purple jug isn't cheap. Expensive oil is often a waste of money and a 5‑quart jug of Royal Purple can run $5 to $15 more than Mobil 1 ...