I believe it stands for "ultra" or "ultimate".
BTW, shadow, congrats on "striking some gold". These things are long "out of print" and are **** fine filters (although some on here I'm sure will argue that point, what else is new??).
They are a champ made filter with true synthetic wire backed media. Suposedly they filter better then the standard AC-delco, which is already near the top of the pack.
quote: Originally posted by T-Keith: They are a champ made filter with true synthetic wire backed media. Suposedly they filter better then the standard AC-delco, which is already near the top of the pack.
Yes, right. It's been so long since I've had any of these things, I've forgotten that fact. I did try to find them, even once discontinued, but I would have had better luck in trying to find the mythical, green elf made stuff!