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Minimum thickness is stamped on the disc itself, but lipping, blueing and judder tell you long before the vernier does. Here is what we check on the counter before selling a customer a pair.

Fitting a full-SAPS oil to a car with a particulate filter will block it, and the damage is not covered by warranty. Low-SAPS, the right ACEA rating, and why the viscosity on the cap is only half the answer.

A conventional flooded battery in a start-stop car will be flat inside two winters. AGM construction handles the constant shallow cycling, and the vehicle usually needs coding to the new battery afterwards.