It's surprisingly easy to stick to motor oil options that are manufactured in the United States. Plenty of reputable brands ...

Castrol's focus — at least in its marketing — is on making a motor oil that's designed primarily to fight the buildup of sludge in an engine. To that end, its GTX Full Synthetic is reportedly ...

If you’ve got a more modern car, feed it synthetic motor oil for its entire life to avoid issues with its more complex engine down the line. You can choose between Castrol EDGE and GTX Full ...