I am thinking strongly about switching to Schaeffer's Oil. Would 5000 miles per oil change be acceptable using that oil? I drive 10 miles each way to and from work (mixed highway and city driving), and since I work 12 hour shifts I get three and then four days off. On my days off, I often take long trips because I do a lot of photography. I have already ordered Neutra and Schaeffer's oil supplement from Tim Mills-he is really cool and will allow a person to make small orders. I have been using Chevron oil which I really like, but the Schaeffer's Oil would allow longer oil changes and save money. I drive a 2001 Saturn SL2. I like to use 10W-30 in the summer, because it gets so hot here, and 5W-30 the rest of the year. What about the oil filter? Change it at 3000 miles and add oil to replace that in the filter, or use an oil filter like Amsoil or K&N?