Did any one use them in the past?
Are they as good as they are advertised? Any opinions?

They are quiet expensive, but from what it sounds they migth be worth it if they extend the life of the engine.

http://www.cmfilters.com/
http://www.cantonracingproducts.com/

 

I really don't think they do that much as far as street application and normal driving. Just switch to synthetic oil and change every 3 thousand miles, your engine will last forever. I knew a guy with 93 S-10 blazer and it had 450,000 miles on, and it was the original engine thanks to Mobil 1.