However, because oil changes aren't a highly profitable service for most shops, and they usually assign entry level, low pay techs to the jobs, often the simple things get missed because of a lack of knowledge or a lack of desire. I have found many air filters and cabin air filters that weren't checked because it was a challenge. I took some pictures and will explain as I go.
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Chrylser Pacifica air filter
An important point is that both of these vehicles are daily drivers. The owners rely on their cars to get them where they need to be. In these images, we see a serious restriction to air flow. The problem with that is that an engine is an air pump. It pulls air in, mixes it with fuel for combustion, then pushes it out of the exhaust. If there is a problem in the beginning, you can guarantee problems down the line. Poor fuel mileage, spark fouling, increased emissions and other running issues. It may not seem like much in the immediate, but cutting corners in vehicle maintenance can cost the owner down the road.