I have an OilGuard EPS10 on my !echo! that was installed early on in the life of the car; This was all prior to my extensive reading on BITOG; If I had to do it all over again, I wouldn't bother or if I did, I would get a dual Amsoil setup. There really isn't any room under the hood and it would require removing the front bumper. Right after I bought it the filter prices skyrocketed so I don't bother changing the filter element unless it plugs or malfunctions. (2 have malfunctioned)
That being said 300K+ miles and I'm just coming around to dnewton's way of thinking.
My car consumes 1qt/1-2K now which is actually a blessing in disguise when we are going on a few months without a dry day to do an OC.
I run M1 EP filters in the winter so I don't have to bother changing the filter during an OC, I just drain and refill (5 minute OC)
2003 Echo, >330K, Supergard 5W-30
2006 B2300, 84K,ALM;
I prefer cats over dogs; Cats have the sense not to roll in their own poop