Brake pads, and how long they really last
A worn pad is not a matter of mileage but of the metal left on it.
Choosing a cabin filter for a diesel
Carbon layers cost more and do a different job from the paper ones.
Why a wiper blade streaks in one direction
The rubber takes a set, and the arm's spring is usually innocent.
Spark plugs and the gap nobody measures
A new plug is not always gapped for the engine it is going into.
Oil filters that bypass under load
The valve opens at a pressure the box never prints on the outside.