Hey you shade tree mechanics, what are your qualifications to perform vehicle maintenance? The condition of a vehicle running the speed limit on a highway is probably as important as the abilities of the driver of a speeding vehicle.
Don't put my life at risk just so you can save a couple of dollars, do the right thing have your autos professionally maintained.
I'm not paying $150 for an oil change each month... especially when those shops won't follow the manufacturer's recommendations...