So if I finally dissect the ST3593 I took off several years ago, that will be relevant again? Without taking it apart yet, I can tell the anti-drainback valve is no good. It was the only SuperTech filter I ever bought, and I left it on more miles than any other one (roughly 21K, I think).
2011 Toyota Prius now at 86K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K