Mineral Engine Oil

It is cheaper but less stable at extreme temperatures. Some older engines and classic cars were designed for it. Modern engines rarely accept it in their specifications. Classic car owners often choose mineral oils with higher zinc content to protect flat-tappet camshafts.

Its base oil contains molecules of varied size that break down and thicken faster than synthetic oils.

Using mineral oil where synthetic is specified can damage turbochargers and void warranties. Change intervals with mineral oil are shorter.