Neither of my cars have such a dual-element oil filter.

$8/gallon? I thought that you ran synthetic. The last oil I bought for the VW cost about $25/gallon.

But if it helps the car run a bit longer and I get lucky (i.e., don't get hit), I come out ahead. If I do get hit, I come out behind no matter what maintenance has been done.

You can do whatever you want with your car. Why not just continue the experiment, and report back at regular intervals that exceed a week each. This endless posting and replying to threads telling people to not change their oil is pointless.

How does anyone here know that you aren't changing it every thousand miles, only to claim otherwise? Your credibility is in the toilet.