Duramax 6.6L Bypass Oil Filter Kit "Under the Hood"

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Duramax 6.6L Bypass Oil Filtration System  with Under-the-Hood Bracket (2001 to 2021)

This kit includes

  • "EXTREME2" bypass oil filter housing
  • 1 "EXTREME2" filter element
  • 2 In/Out fittings (E4MP6M)
  • 2019-older:  4 Hose fitting (P6JF) 
  • 2020-newer: 4 hose fittings (3 P6JF1, 1 EP6JF) 
  • 2019-older: 1 Pressure port fitting elbow (E6BP)
  • 2020-newer: 1 Pressure port straight fitting (M205)
  • 1 Black oil filler cap with swivel return port (FLLCDUO) and 1 Oil filler cap fitting (E28P6M)
  • Oil drain plug return option: 1 tee fitting (TM1275) and 1 fitting (E28P6M)
  • Note: Oil drain plug option is only for 2020-Newer vehicles without manufacturer breather tube upgrade. Oil filler cap will not be included if you select the oil drain plug return option. 

  • Hose length by oil return option:oil filler cap 2ft and 5ft hose (HOS38)
  • Hose length by oil return option: oil drain plug 5ft and 7ft of hose (HOS38)
  • 1 Duramax 6.6L under-the-hood bracket with bolts (UTHS)
  • 1 year Insane Diesel manufactured part warranty

Important notes regarding 2020-Newer Duramax 6.6L Engines

Duramax Manufacturer Service bulletin (not related to our filter) mentions many are experiencing oil loss after pulling heavy loads or traveling long distance. Oil loss is due to breather tube drawing in excessive oil that is building up in that part of the engine. Some dealerships are offering a breather tube upgrade to resolve this problem. If you have not received a breather tube upgrade by the manufacturer then we recommend returning your oil through the oil drain plug (select that option when ordering). If you did receive the breather tube update then our oil filler cap will be the best option to return your oil. This only applies to Duramax engines from 2020 to newer. Questions? Text or call 801-901-0667

 Installation Guide: 

Duramax 6.6 Installation Guide (PDF)

Duramax 6.6 Under-the-Hood Kit (VIDEO)


Radically extend engine life 2X
Reduce engine wear
Keep oil up to 4X cleaner than new oil
Progressive 3 stage filtration down to 1 micron, won't clog or drop efficiency like others filters
Reduce soot and carbon buildup
Reduce erosion of hoses & seals
Extend oil change intervals
Remove 99.9% of moisture
Improve gas mileage
Improve oil cooling
Large housing holds 4000X more contaminants than OEM filters
Easy installation and maintenance
15K (or up to *25K miles) 250 hours, or 1 year before maintenance is needed
*Condition based oil analysis monitoring recommended when extending oil/filter change intervals

 Learn More About the EXTREME Bypass Oil Filter System Here

Installation/assembly required by professional mechanic


15.00 LBS
12.00 (in)
6.00 (in)
12.00 (in)