Folate and folic acid are two forms of vitamin B9. Folate refers to the natural form of vitamin B9 found in foods, like leafy green vegetables. Folic acid is the synthetic (man-made) version found ...

The Audi S4 (B9) delivers serious performance, luxury, and everyday usability—but is it so good that you don’t even need an RS4? Join me for my first drive as I put this sports sedan to the test!

It’s important to carefully check the trims of the car you’re interested in to make sure that you’re getting the features you want, and aren’t overpaying for those you don’t want.

Swapping between twin-turbocharged, supercharged V6 and even a naturally aspirated V8 engine in times gone by, the B9 S4 returned to a single-turbocharged 3-litre V6, combined with an eight-speed ...