alltruck - oil bath filters are the best if properly cared for [especially in very dusty conditions], but many folks that don't really use the trucks don't like the "mess"
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics