Has anyone used a Trasko filter when doing an Auto-RX treatment? Once, when I took off a conventional filter after the Auto-RX and cut it up, the pleated paper was covered with sludge. It probably was still flowing some oil, but even if it couldn't, there is a bypass valve in it. If that were to happen to a Trasko, the screen could clog, and there is no bypass for the screen, so the engine would cease to get oil, unless the engine has a built in bypass, like some GM engines do.