Dual-Gard
Oil Filtration System
 Performance
Convenience
Versatility
Superb Engine Protection and Safety
Proof From the Test Labs
Wear tests have shown particles of contamination in the sub-20-micron range are most harmful to rings and bearings. Most trucks are sold with a full-flow filter as their only oil cleansing unit. A study by the Milwaukee School of Engineering determined the filtering efficiency of four top-selling full-flow filters compared with a BE-90 AMSOIL Spin-On By-Pass Filter. The graph shows the By-Pass functioning at 97.6% efficiency in removing particles as small as 3 microns, a feat no full-flow filter can match.
Why By-Pass Filtration?
Answer: Because even the finest full flow oil filtration simply can't do the job completely. Full-Flow filters are installed in-line in an oil circulation system, so they must allow constant oil flow to the engine. Therefore the filtration media has to be relatively coarse and open to provide a rapid oil flow
But this "free-flow" also compromises the filter's ability to remove the smaller abrasive particles: typical flow-flow filters only remove particles down to 25-40 microns. The problem is that smaller-sized particles, from 5 to 20 microns, are responsible for up to 60% of engine wear. This means a conventional full-flow filter leaves countless wear-causing particles in the oil, grinding away at your engine and shortening its life.
AMSOIL Dual-Gard
Versatility:
Accomodates any two AMSOIL Spin-On By-Pass Filter Elements. Their unique internal flow director and follower spring system provide a non-channeling filter media.
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Minimum Area Needed for Dual Mount
and Spin-On Oil Filter Elements
(Mount and Element Heights Plus
1-inch Removal Clearance)
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Convenience:
Elements spin on and off for fast, neat filter changes.
Protection:
The stacked disc type by-pass filter has been shown to reduce piston ring and rod/main bearing wear 75% to 91% (Society of Automotive Engineers paper 881826).
By-Pass Safety:
A metering orifice inside the mount controls oil flow so that it never draws more than 10% of the oil sump's capacity. At an engine speed of 45 mph, the AMSOIL Dual-Gard By-Pass Filter cleans all of the oil in the system every 5-10 minutes (depending on engine RPM, sump size, and oil pump ratio).
The Dual-Gard Mounting Kit:
The kit, AMSOIL part number BMK-12, contains a mount, mounting hardware, a restrictor fitting, and two 3/4 inch-16 to 1/4 inch J.I.C. fittings. Complete installation instructions are included along with an additional parts list of plumbing hose and fittings available separately from AMSOIL. Spin-on filter elements, available in three sizes, should be purchased separately in pairs based on sump size or available room in the engine compartment. This is merely a guide, since the larger the element used, the less frequently it will need to be changed.
- For a crankcase sump of 15 to 18 quarts use two BE-90 filter elements.
- For a crankcase sump of 15 to 30 quarts use two BE-100 filter elements.
- For a crankcase sump of 15 to 42 quarts use two BE-110 filter elements.
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Other Applications:
- Stationary Engines
- Large Compressors
- Electric Generators
- Construction Piggy-Backs
- Filter-Pump Carts
- Marine, Forestry, Mining
- Agriculture & Irrigation
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Your AMSOIL By-Pass Filters will last twice as long as your regular engine filter, so change them only half as often.
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