Wondering if 15W-40 oil is only for diesel engines? Learn where this oil grade is used, and whether it’s safe for gas-powered ...

Most vehicles can't use direct-drive systems because doing so would stall the engine; a transmission allows the engine's ...

At the car repair shop ... But in reality, gear oil is very different from transmission fluid, and the two are not interchangeable. The term "gear oil" is actually broad, as it applies to various ...

Maintenance is key to long life for your vehicle—and here’s the scoop on its replacement parts and fluids ... How Often Should I Change My Car's Engine Oil? See your owner’s manual for ...

Stick to your manufacturer’s time or mileage recommendation for oil changes—it’s worth it. Ask your mechanic to check your coolant, brake fluid, transmission fluid, and power-steering fluid .