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Mwebb,
So you have the OEM: tires, filters, dealer supplied fluids in your car?? Unfortunately, vehicles are designed by engineers but built by business men. When CompanyX needs tires for 400,000 vehicles they get bids for the lowest cost option that satisfies the minimum required standard. I was a service writer at Sears during the upsurge in H,V,Z speed tire. Watching high speed video of the distortion of a tire, at highway speeds, you can see the difference between 'Ok' and 'Better'. If engineers had the final say so every car sold would have a reusable air filter. I'm saying, don't look at the vehicle as a feat of design & engineering, it's a creation of design, engineering & marketing.
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