Of those different viscosities, two of the most commonly used in many modern cars include 10W-30 and 5W-30. To understand the ...

Multi-viscosity oils (5W-20 and 5W-30) are formulated to flow faster when cold while still providing high-temperature protection. However, the 5W-30 oil is more viscous than 5W-20 at the engine's ...

While trucks won't be required to meet new federal fuel efficiency standards until 2014, Castrol Heavy Duty Lubricants brings improvements in fuel economy to fleets right now with new Elixion low ...