A vehicle has several components that need to be maintained, from tires to brakes to suspension. However, the most critical of these components are found under the hood—namely the engine and transmission. We’ve asked eight Diamond Certified Expert Contributors to give their tips on caring for these vital organs of vehicle operation.



Fluids are the lifeblood of the engine, providing the necessary cooling and lubrication to allow its moving parts to function safely and smoothly. That’s why ongoing fluid maintenance is crucial for maximizing engine lifespan. Ken DeMartini of Japan Auto Repair, Inc. says this starts with engine oil. “One of the most important aspects of vehicle maintenance is having your oil changed at regular intervals—after all, Read more