Spark plugs are an integral part of your engine, but they need to be replaced every so often. We'll tell you how to find out and what socket size you'll need.

This 12-point, thin wall spark plug socket measures 14mm with 3/8" drive. It's constructed from chromium plated material and is a popular choice among car owners who need a 14mm thin wall socket.

18mm-to-14mm adapters (left) are necessary to use 14mm automotive spark plugs. To prevent the adapters from unthreading, Mike Starkey came up with a plug adapter lock wrench (center).

Moroso PN 71910 is a flat washer assortment for gasket seat 14mm spark plugs. For 14mm tapered seat spark plugs, use Moroso conical washer assortment PN 71900.