Protects. Performs. Lasts.

Filtration that keeps iron on the road.

Full-line heavy-duty filtration for Class 8 fleets, off-highway equipment and stationary power.

Explore the line → Cross-reference a part

Cross-reference lookup

Enter a competitor or OEM part number.

TRY: P551670 · LF777 · BF1259 · AF351K
Heavy duty performance Built for full drain intervals under load, vibration and heat.
Advanced filtration Multi-layer synthetic and blended media, depth-loaded pleats.
Maximum protection Verified efficiency and capacity to ISO and SAE test methods.
Trusted by professionals Stocked and specified by fleets, dealers and jobbers.
Cross-referenced against the filtration and OEM part numbers your shop already runs
01Product line

Every filter on the unit.

Nine product families covering the complete service package.

W-SERIES · OIL

Oil filters

Full-flow spin-on, bypass, combination and cartridge lube elements.

  • Full-flow spin-on & cartridge
  • Bypass / combination units
  • Silicone ADBV for cold starts
EFFICIENCYβ20(c) ≥ 200
BURST> 350 psi
W-SERIES · FUEL

Fuel filters

Primary and secondary diesel filtration for HPCR injection systems.

  • Spin-on, cartridge & in-line
  • HPCR-grade 2 µm final filtration
  • Biodiesel-compatible media & seals
EFFICIENCY99% @ 4 µm(c)
STANDARDISO 19438
W-SERIES · FUEL/WATER

Fuel/water separators

Two- and three-stage separation with coalescing and barrier layers.

  • Coalescer + hydrophobic barrier
  • WIF sensor & heater-ready bowls
  • Handles ULSD & B20 blends
FREE WATER≥ 99% removal
METHODSAE J1839 / J1488
W-SERIES · AIR

Air filters

Radial-seal and axial-seal primary elements with matched safety elements.

  • Primary + safety element sets
  • Nanofiber surface-loading media
  • Molded urethane sealing system
EFFICIENCY99.9% gravimetric
STANDARDISO 5011
W-SERIES · HYDRAULIC

Hydraulic filters

Return-line, pressure, suction and in-tank elements in glass-fiber media.

  • Ratings from 3 to 25 µm(c)
  • High-collapse wire-backed builds
  • Water-absorbing media available
BETA RATIOβx(c) = 1000
STANDARDISO 16889
W-SERIES · COOLANT

Coolant filters

Spin-on coolant filters with controlled-release SCA charge.

  • SCA-charged & non-chemical (ELC)
  • Protects liners from cavitation
  • Nitrite / molybdate chemistries
CHARGE2–15 units
CHECK1.2–3.0 units/gal
W-SERIES · AIR DRYER

Air dryer cartridges

Desiccant and coalescing cartridges for the brake air system.

  • Fits common AD-series & System Saver dryers
  • Coalescing oil-removal stage
  • Seal kit and grease included
DEW POINT≤ −30 °C
OIL CARRYOVER< 0.1 ppm
W-SERIES · CCV

Crankcase ventilation

Closed and open crankcase coalescers that pull oil mist out of blow-by.

  • CCV & OCV coalescing elements
  • Protects turbo, EGR & aftertreatment
  • Low restriction across the interval
AEROSOL≥ 95% capture
RESTRICTION< 4 in H₂O
W-SERIES · CABIN / TRANS

Cabin & transmission

Particulate and carbon cabin filters, plus transmission elements.

  • Particulate & activated carbon
  • Automatic & manual transmission elements
  • Power steering & gearbox filters
CABINPM2.5 ≥ 95%
TRANSβ10(c) ≥ 200
Cummins
Caterpillar
Detroit Diesel
Volvo / Mack
PACCAR MX
International
John Deere
Komatsu
Perkins
Isuzu / Hino
Deutz
Doosan

Weston builds to the fit, form and function requirements published by the equipment manufacturers listed above.

02Inside the can

Cut one open. Nothing to hide.

A filter is only as good as the parts you never see.

1 2 3 4 5 6
01

Deep-drawn steel shell

Rolled-seam, deep-drawn shell tested well past the pressure any lube gallery will see, so the can never becomes the weak point in the system.

03Validation

Rated on the bench, not on the box.

Micron numbers mean nothing without the test method behind them.

Method What it measures Where Weston applies it
ISO 4548-12 Lube efficiency & capacity Multi-pass particle counting with continuous injection.
ISO 19438 · SAE J1985 Fuel efficiency Multi-pass and single-pass efficiency by online particle counting.
SAE J1488 · J1839 · ISO 16332 Water separation Emulsified and free water removal measured with online droplet sizing.
ISO 5011 Air cleaner performance Gravimetric efficiency, dust holding capacity and restriction curve.
ISO 16889 Hydraulic beta ratio Multi-pass beta rating at terminal differential pressure.
SAE J905 · J3236 Integrity & valve function Burst, collapse, bubble point, media migration and valve calibration.
ISO 4406 System cleanliness code Target fluid cleanliness by application.
0Active SKUs across nine families
0Lube efficiency at 20 µm(c)
0Standard order-to-ship on stocked lines
0Warranty, parts and consequential damage
04Cross reference

You already know the number.

Type the number written on the filter that came off the unit.

WESTON MASTER CROSS-REFERENCE FILE

Demonstration dataset.

05Applications

Where the duty cycle hurts.

Dust load, fuel quality, heat and idle time change what a filter has to survive.

On-highway fleets

Long-haul and regional Class 6–8.

LUBE · FUEL · CCV · AIR DRYER · CABIN

Construction & mining

High silica dust and heavy hydraulic duty.

AIR · HYDRAULIC · FUEL/WATER · LUBE

Agriculture

Seasonal peaks, on-farm fuel storage and field dust.

FUEL/WATER · AIR · HYDRAULIC · TRANS

Power & marine

Standby and prime gensets, workboats and auxiliaries.

FUEL/WATER · LUBE · COOLANT · AIR
06Quality system

Built to the OEM print.

Weston is built for shops that will not gamble on a warranty claim.

  • Fit, form and function to OEM requirements Thread pitch, gasket geometry, valve settings and flow rates matched to the original service part.
  • IATF 16949 and ISO 9001 manufacturing partners Audited plants, PPAP-style submissions and SPC on critical dimensions.
  • Lot traceability on every box Date code, plant and media lot printed on the can and the carton.
  • 24-month warranty including consequential damage If a Weston filter causes a failure, the claim covers the engine work.
Weston W-51768 oil filter and W-95020 fuel filter installed on a Cummins X15 engine W-51768 + W-95020 · CUMMINS X15
Weston W-95020 heavy-duty fuel filter W-95020 · FUEL FILTER

The failures we design against

Aftermarket filters do not usually fail by tearing in half. They fail quietly.

±1 PSIBypass valve calibration tolerance
−40 °CCold-start seal & ADBV verification
Pallet of Weston heavy-duty air filters in export cartons on an EPAL pallet in the distribution center PALLETIZED · EPAL · EXPORT PACK
07Supply

A filter on a shelf beats a promise.

Downtime is measured in hours, not in lead times.

  • Distributor and jobber programs Tiered pricing, protected territories and stocking packages by fleet profile.
  • Private label and OE supply Full private-label programs including artwork, cartons and dedicated part numbers.
  • Catalog data ready for your system Application data, VMRS coding, dimensional attributes and images as flat files.
  • Field support that shows up Oil analysis interpretation, cut-open reports and PM interval studies.
Request the line card →

Protects. Performs. Lasts.

Engineered to protect. Built to perform.

Talk to a filtration specialist →
08Contact

Tell us what you run.

Send the engine model, the equipment list or a photo of the filter you are replacing.

We answer quote requests within one business day.

Request received.