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

Can stuck piston rings be restored without teardown? A 500,000-mile Valvoline engine test shows how deposit removal may ...

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 ...

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 ...

We may receive a commission on purchases made from links. Turbocharged engines are nothing new — the systems have been around since the late 1800s, first applied to airplane engines and eventually to ...

Used oil analysis is like a health check-up for your engine, revealing hidden wear, leaks, and performance issues before they become costly repairs. From daily commuters to high-performance machines, ...

We may receive a commission on purchases made from links. For an engine to work efficiently (or work at all, for that matter), one factor that has a huge bearing is the engine oil. This miracle liquid ...