Revisit MotorTrend's 2004 comparison test as the Porsche Cayenne S battles the BMW X5 4.4i, Infiniti FX45, and Cadillac SRX V8 AWD on the street and at the track to crown the ultimate performance SUV.

Yamaha Goes All-In on the 2027 YZ250F — And the Rest of the Off-Road Range Follows Suit Yamaha dropped a significant ...

Brian Wolfe and Ben Strader dyno-tested a twin-turbo Godzilla. Big boost pushed the 7.3-liter V8 platform beyond 1,800 ...

The Dodge Magnum SRT8 and Mercedes-Benz E55 AMG wagon delivered acceleration numbers so surprising that MotorTrend ran ...

Four-stroke engines, which make up 99% of vehicles on the road, rely on a system for managing air intake, compression, combustion, and exhaust within a sealed combustion chamber. Poppet valves are ...

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. Over the course of a few hours, body water deficits can occur due to reduced intake or ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace the ...

CHEVRON WITH TECHRON! BP gasoline with Invigorate! And here's a new one: Nitrogen Enriched Gasolines from Shell! Fuel additives have some pretty hokey names, but behind them is real chemistry. It's ...

This article was researched using 4 sources. See our methodology and corrections policy. A valve job is a major engine maintenance service that involves removing, disassembling, inspecting, refacing ...

What does the EGR valve on a car do? An EGR valve is short for Exhaust Gas Recirculation valve. You can find an EGR valve in modern internal combustion engines (ICE) in petrol and diesel cars. An EGR ...