Synthetic oil used to be something only performance ... The alphanumeric codes on a quart of oil—5W-30, 0W-20, etc.—denote its “weight,” or viscosity. Thicker, higher-viscosity liquids ...

If your mechanic recommends a high-mileage motor oil, how do you know when it's worth it to upgrade? And what are the pros ...

For instance, using a 5W-30 oil instead of a 10W-40 can improve mileage by up to 2%. This is because thinner oils circulate ...

Lubricant manufacturer EnerG Lubricants has announced that it has become the first Indian company to get global approval from ...