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PLEASE NOTE:  We've been providing "Show Specials" since November.  Recently, we've seen disruptions on our website that have caused the link to the sales page to be corrupted. To circumvent this, we offer the Show Special pricing for 3" and 3.5" kits at $200 US flat (incl. shipping/taxes) to anyone for now.  All we ask is that you call us rather than try to order on-line  (323 726-2199). We also offer volume discounts for 3+ kits and can accommodate other special orders.    Thank you for your business!  


MagDog is only for engines with spin-on oil filters. Specifically designed to remove ferrous (metallic/magnetic) debris from the oil, the best use for MagDog is when:

  • Breaking in new or replacement engine parts
  • Racing and dirt sports,  or
  • When very frequent oil changes are required.

Each MagDog kit contains the MagDog chamber and fitted nipple, two sets of gaskets, a 1/8" access plug, a hex key, and instructions. We will need to know the full-flow filter make and model for proper fitment; or the vehicle year, make, model, and engine size. Please see links for an OEM guide or contact us if you are unsure of the size required for your vehicle or if it does not appear here as we are adding new sizes and nipples. The 20 x 1.0 mm nipple, for example, was made to satisfy a demand by Dwarf racers.

Filter Diameter

3.0" 
3.0"

3.0" .

3.0" 

3.0" 

3.0" 

3.5" 

3.5" 

3.5" 

3.5" 

3.5" 

3.5" 

3.5" 

3.5" 

4.5" 

Filter Thread/Pitch

3/4"-16

13/16"-16

10mm x 1.0.

18mm x 1.5

20mm x 1.5

22mm x 1.5

3/4"-16

13/16"-16

10mm x 1.0

18mm x 1.5

20mm x 1.5

22mm x 1.5

1"-12

1"-16

1"-16

PPI Reference Number

MD30A

MD30C

MD30X

MD30D

MD30E

MD30F

MD35A

MD35C

MD35X

MD35D

MD35E

MD35F

MD35G

MD35H

MD45H

Price

$80.00

$80.00

$80.00

$80.00

$80.00

$80.00

$90.00

$90.00

$90.00

$90.00

$90.00

$90.00

$90.00

$90.00

$125.00

MagDog comes ready to install, with a limited warranty to the original purchaser for a period of two (2) years from the purchase date under normal use and service against defective materials or workmanship. This warranty is void if the unit has been damaged by accident, unreasonable use, improper installation or service, or other causes not arising out of defects in material or workmanship. MagDog may be returned to PPI unused, in its original packaging, within three months of purchase. A restocking fee may be charged.   Shipping (US addresses) and taxes are included in the cost.

See a MagDog installation and maintenance side show overview >>

Note: Due to its different internal architecture, MagDog cannot be upgraded to TopDog-V.