Engine oil is vital for protecting a car's engine. If your car requires 5W-20, can you use 5W-30 instead? Here's why those numbers are so important.

A new oil by Shell aims to solve this issue by offering a 5W-30 full-synthetic heavy-duty oil for both gasoline and diesel engines, including Class 6-8 heavy-duty trucks.

Engine oil is vital for protecting a car’s engine. If your car requires 5W-20, can you use 5W-30 instead? Here’s why those numbers are so important.