The hydro filters are made out of fiber, something like the fuel filter. I wanted to see what is so special inside them to be such a high price tag on them. Nothing I could tell. I thought I might be able to buy them at walmart for $2-$3. That's all a car filter cost. No deal at walmart. The Wix filters didn't cost any less than the dealers price. So, I might have to stick with the dealers high prices until something else comes up.