Engine Oil Filtration

By-pass Kidney Loop System Download Brochure

Ultimate By-Pass Kidney Loop Engine Oil Filtration Schematic

The 3-micron continuous flow by-pass systems are specifically desinged to filter a small percentage of the oil at a time through a dense depth-type filter element. The filter will absorb water and remove solid contaminates down to 1-micron including: dirt, metal, silt, soot, sludge, coolant, carbon byproducts, and other harmful solids. For the installation we locate a engine pressure plug on the engine block for the oil pressure source into the filter and then return ultra clean oil back into the oil sump. Since the filter removes water and very small solid particles the engine oil will last many times longer and it will greatly reduce engine component wear.

We guarantee to reduce engine oil changes and extend the life of your engine!

Application Photos

Ultimate Housings and Filter Specs

All heavy duty housings are made of carbon steel with a black powder coated finish inside and out with all stainless internal wetted parts. The industrial strength housings use a bolt down cover to ensure a rugged positive seal.

Best housing warranty in the industry. 10 years.


Specifications U-150L U-500L U-1000L U-2-1000L
Dimensions DxWxL 6″ x 8″ x 14″ 8″ x 12″ x 14″ 8″ x 12″ x 24″ 8″ x 24″ x 24″
Dry Weight 28 lbs. 36 lbs. 50 lbs. 100 lbs.
Oil Sump Sizing Recommendation up to 12 qts. 12-20 qts. 20-55 qts. 55-100 qts.
Max System Pressure 80 psi 80 psi 80 psi 80 psi
Engine Oil Filter 7142 7342 7544 (2) – 7544
Filter Dimensions 5″ x 8.75″ 7″ x 10″ 7″ x 19.75″ 7″ x 19.75″ ea.
Filter Micron Rating 3-Micron 3-Micron 3-Micron 3-Micron
Filter Performance per ISO 16889 B3<(c)=200 B3<(c)=150 B3<(c)=150 B3<(c)=150
Filter Solid Holding Capacity 2-3 lbs 4-5 lbs 8-10 lbs 8-10 lbs each filter
Filter Water Holding Capacity 1 qt. .5 gal. 1 gal. 1 gal. each filter
Water Removal Efficiency 99.90% 99.90% 99.90% 99.90%
Filter Service Interval 30,000 miles or 1,000 hrs. 30,000 miles or 1,000 hrs. 30,000 miles or 1,000 hrs. 30,000 miles or 1,000 hrs.

Cellulose Depth-Type Filter Media


  • Axial flow between layers of media
  • Creped cellulose with interlocking layers to remove solids efficiently
  • High efficiency filtration with low micron levels (<1 micron)
  • Performance to B<3(c)=150 (Per ISO16889)
  • 99.33% efficient at 3-micron size
  • Very high solid holding capacity= 8-10 lbs per filter
  • Removes dirt, metal, silt, soot, sludge, coolants, and other solids
  • Can achieve very low ISO cleanliness levels
  • High water holding capacity= 1 gallon per filter
  • Will absorb free and emulsified water
  • Can maintain water levels to below 50ppm
  • Water efficiency 99.90%
  • Inexpensive high quality product
  • Long filter life: will last many times longer than conventional pleated paper filters
  • Most conventional filters will not remove water

How to Order a By-Pass Kidney Loop System

Model and Oil Sump Size:

U-150L = Up to 12 quarts
U-500L= 12–20 quarts
U-1000L = 20–55 quarts
U-2-1000L = 55–100 quarts

For larger sumps contact us for additional options.

Top 20 Major Benefits

  • Products made in the USA
  • 10 year housing warranty
  • Lifetime filter warranty
  • Proven product
  • Filter absorbs and removes water
  • 3-micron depth type filter
  • Long depth-type filter life
  • Longer OEM filter life
  • Longer oil life
  • Longer engine component life
  • Additional make up oil
  • No more worries about missing service intervals
  • Filter removes the majority of contaminants that cause the majority of the wear
  • Low volume-low pressure filtration through a dense filter media
  • Expect great oil cleanliness
  • Pressure gauge to help monitor filter life
  • Quick return on your investment
  • Lower maintenance costs
  • Less downtime
  • Cooler running system
  • Higher engine performance
  • Change PFS filter every 30,000 miles or 1,000 hours

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  • Are you ready to save money and extend equipment life? Contact us for an estimate.
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    Vital Protection for Machines since 1981