Date: 16 Oct 2001 21:35:35 -0700
From: (Johannes H Andersen)
Subject: Re: Can I reduce oil changes with a bypass oil filter?

saab85900nopsamcom (Saab85900) wrote in message news:<>... > >Excuse me, but what is a bypass oil filter? There is already an oil > >filter; the oil is forced through the filter. The oil filter is always > >changed at the same time the engine oil is changed, I certainly hope so. > >I can't see the point, or is it just me? > > A bypass filter is a second filter added to the oiling system. It takes a > small percentage of the oil which is flowing and sends it through an extremely > fine filter. > A standard full-flow filter is usually quite effective in the 20-40 micron > range, and won't take out water. At least some bypass filter elements will > remove particles less than 1 micron, and also remove water. Without water, it > is very difficult to make acid. Without the solids and acid, the oil will > remain serviceable for a much longer period. > Provided there is sufficient pumping capacity. I would worry if the engine is not designed for this extra filter; the oil flow could be stagnated. Johannes > Many large diesels have been using bypass filters for many years. > > Dick in Falls Church

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