WIX® 42521 - Air Filter

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Product Details

WIX  Accessories

Air Filter (42521) by WIX®. Position: Inner. Considering as much as 10,000 gallons of air must pass through the air filter for every gallon of fuel the engine consumes, WIX air filters play a vital part in preventing foreign particles like soot, carbon and abrasives from entering the fuel mix and damaging your engine. WIX air filter media features nine pleats per inch, resulting in a longer life and the ability to capture more engine-killing contaminants. Panel air filters provide air with a linear path and low air restriction. WIX panel air filters have special pocket pleats in the media, held together with specially formulated adhesive. The filter media is framed by a urethane soft sealing gasket and is supported (when applicable) by a mesh screen, which are both molded in place with the filter element.

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Inner Diameter: 4.575"(116.21 mm)
Outer Diameter: 5.7"(145 mm)
Inside Diameter Bottom: 4.575"(116 mm)
Inside Diameter Top: 0.656"(17 mm)
Inside Diameter Bottom: 4.575"(116 mm)
Height: 12.5"(318 mm)
Media Type: Cellulose
Filter End Material: Metal


  • Prevents foreign particles like carbon, soot and abrasives from entering the fuel mix
  • Ensures superior engine protection
  • Filter media features nine pleats per inch to capture more contaminants
  • Highly durable and reliable
  • Easy installation and maintenance

WIX® is a global manufacturer of oil, fuel, air, hydraulic, transmission, and other filters for automotive, light truck, and heavy duty applications. The company designed the spin-on oil filter that turned the filter market upside down and became a worldwide standard. It also offers revolutionary new heavy duty ecoLAST™ filters which reduce downtime, increase uptime, and prolong useful oil life 2X. WIX manufactures XP synthetic filters which provide technology for the latest improvements in extended mileage, as well as AquaChek filters that remove water from compressed air systems.

Part Number:

Warranty Information

Limited Warranty

New car and equipment warranties remain in effect when WIX filters are used.

WIX Filtration Products warrants each WIX filter to be free from defects in material and workmanship during the period of service life recommended by the engine or equipment manufacturer. This warranty does not apply if the filter has been improperly installed, abused, damaged, used in competitive racing or on modified high performance engines or if used in any aircraft or aviation application.

If your WIX filter is found to be defective in material or workmanship during the period of service life recommended by the engine or equipment manufacturer, WIX Filtration Products will replace the defective filter with another WIX filter.

In order to obtain engine or equipment repairs under this warranty, the customer must, within 30 days after discovery of damage, submit a claim to any WIX represetative, our WIX distributor, or directly. The customer must also allow the WIX Technical Service Department to examine the filter and, if required, the engine or equipment, to determine the extent of damage and whether it was caused by a defective WIX filter.

The filter must be returned, in its original, undamaged condition, to the WIX Technical Service Department to examination.

This warranty is exclusive of any other warranty, express or implied. WIX FILTRATION PRODUCTS EXPRESSLY DISCLAIMS, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBLITY AND OF FITNESS FOR A PARTICULAR PURPOSE. The foregoing states WIX Filtration Product's entire and exclusive liability and the buyer's exclusive sole remedy for any damages or claim made in connection with the sale of a WIX filter. WIX Filtration Products shall in no event be liable for any special, incidental, or consequential damages whatsoever, except those specifically provided for in this warranty.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusion may not apply to you.

This warranty gives you specific legal rights and you may also have other rights, which vary from state to state.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

GMC W-Series
1994 GMC W-Series
  • 6.5L
1993 GMC W-Series
  • 6.5L
1992 GMC W-Series
  • 6.5L
1991 GMC W-Series
  • 5.8L / 6.5L
1990 GMC W-Series
  • 5.8L / 6.5L
1989 GMC W-Series
  • 5.8L
1989 GMC W7500 Forward
  • 6.5L
1988 GMC W-Series
  • 5.8L
1987 GMC W-Series
  • 5.8L Turbocharged
1986 GMC W-Series
  • 5.8L
1985 GMC W-Series
1984 GMC W-Series
Isuzu F-Series
1998 Isuzu FRR / FSR
  • 7.1L
1997 Isuzu FRR / FSR
1996 Isuzu FRR / FSR
1995 Isuzu FRR / FSR
1994 Isuzu FSR
1994 Isuzu FTR
1993 Isuzu FSR
1993 Isuzu FTR
1992 Isuzu FSR
1992 Isuzu FTR
1991 Isuzu F-Series
  • 5.8L
1991 Isuzu FSR
  • 6.5L
1991 Isuzu FTR
  • 6.5L
1990 Isuzu F-Series
  • 5.8L
1990 Isuzu FSR
  • 6.5L
1990 Isuzu FTR
  • 6.5L
1989 Isuzu F-Series
  • 5.8L / 6.5L
1988 Isuzu F-Series
  • 5.8L / 6.5L
1987 Isuzu F-Series
  • Turbocharged
1987 Isuzu F-Series
  • 6.5L
Isuzu MR
1985 Isuzu MR
Isuzu N-Series
1994 Isuzu N-Series
  • 6.5L
1993 Isuzu N-Series
  • 6.5L
1992 Isuzu N-Series
  • 6.5L
1991 Isuzu N-Series
  • 6.5L
1990 Isuzu N-Series
  • 6.5L
1989 Isuzu N-Series
  • 6.5L
1988 Isuzu N-Series
  • 6.5L
UD 550T
1991 UD 550T
1990 UD 550T
1989 UD 550T
UD 2600
1991 UD 2600
1990 UD 2600
1989 UD 2600
UD 2800
1991 UD 2800
1990 UD 2800
1989 UD 2800
UD 3000
1998 UD 3000
1997 UD 3000
1996 UD 3000
1995 UD 3000
1991 UD 3000
1990 UD 3000
1989 UD 3000
UD 3300
1991 UD 3300
1990 UD 3300
1989 UD 3300

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