Websites using better class of oil as a keyword

Penrite make a Better Class of Oil. Their premium engine oils always go the Extra 10 above the industry benchmark. So if the industry recommends a 10W-30 for example, Penrite make a 10W-40. That's just another part of their commitment to making the best oil for your car. The W number on the front of the pack tells you the viscosity of the oil at start up temperature, while the second number describes the oil's viscosity at its operating temperature. All oils thin out as they get hotter. The higher the second number, the less the oil will thin out. The thicker the oil, the greater the protection for your engine. Which means less wear and greater oil flow which is good news for you and your car.