Jeremy,

I don't remember paying that much for the filter, but I probably just picked up a generic/disposable filter at Autozone ($10-$15?). About these filters lasting 100k miles... the first service for the tranny isn't due until 120k miles. When my tranny went at 95k miles, Isuzu wasn't around to cover the cost of fixing my tranny. Many people I have spoken to have reportedly had success with filter/fluid changes around every 30k miles. My plan now is to change the filter and fluid every 30k miles. Again, this might be overkill, but I'd much rather spend a few bucks rather than a few thousand bucks. I'd never thought about a line filter. If they work, it sounds like good insurance. good luck!