This tip is courtesy of Gary North at http://www.garynorth.com/public/9566.cfm
There is this oil filter called the Frantz Oil Filter, that has been on the market for years that uses a roll of toilet paper to filter oil. It sits in a mesh cage, so none of the TP gets in your car's system. You still have to add a quart of oil when you change the TP every 5,000 miles or so, but you won't have to get oil changes anymore. The main problems are most cars don't have enough room under the hood for one anymore, and you have to get it installed or install one yourself. Here is their site. I guess you could call them and ask if they know if your make and model of car has room for one.