The Mann inline 4, 719/5, and Vanagon, 719/12, filters both have antidrainback flaps inside the perimeter oil entry holes. The Vanagon bypass valve opens at 1 bar the inline 4 valve opens at 2.5 bar. -Dana- Jay L Snyder wrote: > > The "red stuff" is probably Marvel Mystery Oil or ATF. I think the > correct viscosity oil is as, or maybe more important than the filter. Too > thick and the lifters won't get sufficient oil, too thin and they will > bleed down. Most of us tend to use oil on the thicker side as the engines > age. The Vanagon filter will only partially drain, if at all, on > shut-down. There is some internal differences as to pressure drop across > the filter medium. Stick with Mann or Mahle and pre-fill on changes--it > can't hurt. There isn't that much difference in cost. > > Jay '85 Westy |
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