When you take your vehicle in for an oil change — or change you oil yourself if you're so inclined — you probably don't give much thought to what's in the fluid being drained. It might not occur to ...

More cars than ever use full synthetic oil. But when you’re performing an oil change, how do you know whether a full ...

Oil and fluid testing answers both short- and long-term questions about the internal condition of engines, transmissions and hydraulic systems. A one-time sample of engine or transmission oil gives a ...

In 2026, OBD1-era trucks are experiencing a resurgence as enthusiasts embrace hands-on diagnostics and modern upgrades to keep these classics running strong. From testing oil pressure sensors and cam ...