New materials and sizing have reduced failures. Electronic ignitions have increased operating ranges. Now these should be tested for proper resistance before replacement. They are no longer replaced routinely with the cap, rotor and plugs. According to experts, changing filters on a regular basis may have more to do with your car's longevity than any other single factor.
Oil filters are easy to replace and help prevent unnecessary engine wear.
The job of the oil filter is to remove soot, rust particles and other solid contaminants from the oil. Oil filters should be replaced with engine oil every 3,000 miles. Air filters remove dirt by trapping particles as air passes through the filter media. They also protect the carburetor in older cars, preventing dirt from clogging the air bleeds and metering jets. They protect fuel injectors in later-model autos.