These are important things that you should know to protect your engine:
your oil and oil filter as specified in your manual — more often if
your driving is mostly stop-and-go or consists of frequent short trips. A
poll of ASE Master Auto Technicians revealed that regular oil and
filter changes is one of the most frequently neglected services, yet one
that is essential to protect your engine.
Replace dirty filters, such as air, fuel, and PCV. A poorly running engine is less efficient and burns more gasoline. And you may also have to restore headlights as its effect to your car perform.
your engine "tuned up." Replace filters and fluids as recommended in
your owner’s manual; have engine performance problems (rough idling,
poor acceleration, increased fuel use, etc.) corrected. Given today's
high-tech engines, it's wise to have this type of work done by automobile technicians who are ASE-certified in engine performance.