Cold air is good. Hot air is bad. Every gearhead, young and old, is familiar with this line of thinking. We buy hoodscoops, cold-air intakes, and all other manner of contraptions to help feed our ...

Q7 buyers have a choice of the 3.2-liter 240-hp V6 from the Touareg or the next-generation 4.2-liter V8 with stratified fuel injection making 350 hp. The Q has paddle shifters on the sides of the ...

Diesel engines rely on different types of fuel injection. Mechanical was used early on, but common rail became more popular for a few reasons.