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What Is DEF on a Semi Truck? Fluid, Filters, Problems & Maintenance(Post)
What Is a DEF (Diesel Exhaust Fluid) Filter? A DEF (Diesel Exhaust Fluid) filter protects the SCR (Selective Catalytic Reduction) system by removing dirt, debris, and contaminants from the DEF supply
Buyers Guide to Aftermarket Air Breather Panels(Post)Decorative light panels are an outstanding way to start personalizing your truck. Air breather panels offer tremendous visual appeal and can elevate your big rig's nighttime appearance. There are five
Semi Truck DPF Systems: How They Work, Problems, Regeneration & Parts(Post)Let’s break down how to maintain peak emissions performance and avoid excessive repairs on big truck exhausts. Key Takeaways DPFs trap soot, while DEF reduces harmful nitrogen oxide emissions. Watch
What Does the FASS Fuel System Do? (Post)Diesel fuel often contains air, vapor, water, and fine debris - harmful contaminants that hurt fuel pressure stability, injector life, and injection pump health. FASS (fuel air separation system) help
What Year Did Semi Trucks Get DPF Systems?(Post)When Did Semi Trucks Start Using DPF Systems? EPA Rules Explained Diesel particulate filters (DPFs) became standard equipment on new U.S. heavy-duty diesel trucks starting with the 2007 engine model y
Preventative Maintenance Checklist for Semi Trucks(Post)In this post, we’ll cover the need for a semi truck preventative maintenance checklist, and some of the common replacement parts you can buy online and ship directly to your specified address. Key Ta
Best Semi Truck Emergency Kit Accessories to Deter Roadside Breakdowns(Post)It’s cold, and late, and you’re suddenly stalled at the side of the road because your semi truck won’t start or won’t budge. If this sounds like a truck driver’s worst nightmare, it’s because it is.
Wet Line Kits for Semi Trucks 101: The Basics Explained(Post)Ready to transform your rig into a hydraulic powerhouse? A semi-truck wet line kit can do the trick. One of these will turn your truck from a normal highway hauler into a workhorse capable of handlin
How to Winterize a Semi Truck: The Complete Driver Checklist(Post)Cold winter weather, freezing temperatures, snow-covered roads, and adverse weather conditions wreak havoc on semi truck engines and equipment, and can lead to costly repairs if damage occurs. Don’t c
Spare Semi Truck Parts Every Owner-Operator Should Keep(Post)For owner-operators, having the right spare parts on hand is the difference between experiencing devastating downtime and productive uptime. You don’t want to be caught on the side of the road waiting
How A/C Driers Work on Your Semi Truck(Post)Ever wondered why your semi truck’s AC runs smoothly, or why it suddenly stops working? Your A/C receiver, drier, or accumulator is the unsung heroe of your commercial vehicle. Maintaining your A/C d
What are the Most Frequently Replaced Semi Truck Parts?(Post)The parts of a class 8 truck that see the most frequent repair and replacement are areas where tons of heat, friction, and pressure occur. No-brainer, right? Here are some of the most frequently repl
Diesel Truck Engine Maintenance Guide(Post)Semi truck engines can last up to one million miles, or more, before they need to be rebuilt or replaced. During their lifespan, engine system parts experience a lot of heat and pressure, eventually
Seasonal Semi Truck Maintenance Checklist(Post)Freezing winter weather temperatures, heavy snow, ice, and road salt take an unseen toll on your semi truck. Corrosion directly affects your semi truck brakes, electrical terminals, suspension mounts
Semi Truck DPF Box Covers & Slipcovers: Fitment Guide(Post)Semi Truck DPF Box Covers: Types, Fitment & Replacement What Is a DPF Box Cover on a Semi Truck? DPF box covers are exterior panels designed to conceal or protect the aftertreatment housing. They do n
Spring Semi-Truck Maintenance: 5 Checks to Prevent Expensive Repairs(Post)Winter weather causes corrosion, contamination, wear, and hidden damage. Spring is a great time to inspect the truck thoroughly and stop small problems from becoming giant disasters. Five Spring Main
7 Best Exterior Chrome Upgrades for the Kenworth W900A(Post)Outfit your Kenworth W900A model with stunning exterior chrome accessories and stainless-steel upgrades that seamlessly tie together the entire truck’s theme. Classic big rig owners take a lot of prid
Signs of a Failing Heater Box & What to Do About It(Post)Experiencing refreshing cool air in the summer and warm air in the winter is nearly priceless when behind the wheel of a big rig for 11 hours a day. However, if your A/C heater box isn’t working, your
Top Semi Trucks Owned in Each State (Data for All 50 States) (Post)Here's some visual data on the most commonly owned heavy duty semi truck models based upon three popular truck brands: Peterbilt, Kenworth, and Freightliner. DISCLAIMER: (as of 2025) this data is four
Common Steering Problems on Peterbilt 379 Trucks(Post)Here are some of the most common steering problems found on older Peterbilt 379 models, how to diagnose those issues, and how to prevent them. Related Posts: How to Replace a Peterbilt Steering Shaf
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Stainless Steel Air Cleaner Nut Set - 5/16 Inch -18 Thread
UNITED PACIFIC
$43.62Premium Stainless Steel Air Cleaner Mounting Nuts With 5/16 Inch -18 ThreadThis set of 4 United Pacific premium air cleaner nuts are made of 304 polished stainless steel. With a simple twist, these...09-0905400- SKU:
- 09-0905400
- Truck Class:
- Universal
- Material Options:
- Stainless Steel
- Make:
- Universal Items
- Product Type:
- Exterior
- Finish Options:
- Polished
- Ready To Ship:
- Yes
$43.62Qty in Cart: 0Price:$43.62Subtotal: -
FREE SHIPPING OVER $249
15 Inch Stainless Steel Air Cleaner Mounting Bracket For Kenworth W900L & W900L Aerocab
UNITED PACIFIC
$84.9915 Inch Air Cleaner Mounting BracketHelp securely attach and support a 15-inch air cleaner on your Kenworth truck with this stainless steel bracket. Designed for durability and longevity, this...02-0905400- SKU:
- 02-0905400
- Truck Class:
- Heavy Duty
- Length Options:
- 15 Inch
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Kenworth
- Product Type:
- Exterior
- Ready To Ship:
- Yes
$84.99Qty in Cart: 0Price:$84.99Subtotal: -
FREE SHIPPING OVER $249
1.375 X 36.750 Inch Rubber Strap Liner For Air Cleaner Mounting For Peterbilt & Kenworth
UNITED PACIFIC
$6.97United Pacific Rubber Strap Liner For Air Cleaner Mounting* Made Of High Quality Rubber* 1.375 Inch Wide x 36.750 Inch Length* Replaces OEM #'s: K161-3097-1* Sold Individually* Warranty On Rubber...29-090540- SKU:
- 29-090540
- Truck Class:
- Heavy Duty
- Material Options:
- Rubber
- Make:
- Peterbilt
- Make:
- Kenworth
- Product Type:
- Exterior
- Length Options:
- 36 Inch
- Width Options:
- 1 Inch
- Ready To Ship:
- Yes
$6.97Qty in Cart: 0Price:$6.97Subtotal: -
2.5 X 15 Inch Stainless Steel Air Cleaner Strap For Peterbilt 378, 379, 388 & 389
UNITED PACIFIC
$65.99United Pacific Stainless Steel 2.5 X 15 Inch Air Cleaner Strap Fits Peterbilt 378, 379, 388 & 389Secure your air cleaner with confidence using this 2.5 x 15 Inch Stainless Steel Air Cleaner Strap,...01-0905405- SKU:
- 01-0905405
- Length Options:
- 15 Inch
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Peterbilt
- Product Type:
- Exterior
$65.99Qty in Cart: 0Price:$65.99Subtotal: -
Peterbilt 359 5.5 Inch ID 90 Degree Rubber Air Intake Elbow
BESTFIT TRUCK PARTS
$46.91Peterbilt 359 90 Degree Air Intake ElbowEnsure optimal airflow and durability with this high-quality 5.5-inch ID 90-degree Rubber Air Intake Elbow, specifically designed for Peterbilt 359 trucks...01-0905418- SKU:
- 01-0905418
- Product Type:
- Engine Parts
$46.91Qty in Cart: 0Price:$46.91Subtotal: -
FREE SHIPPING OVER $249
2.5 Inch Stainless Steel Air Cleaner Straps By CSM For Peterbilt
CHROME SHOP MAFIA
$226.99Stainless Steel Air Cleaner Straps By Chrome Shop MafiaSecurely mount your 15-inch air cleaner with these extra-wide straps. They are made of corrosion-resistant stainless steel and measure 2.5...01-0905400- SKU:
- 01-0905400
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Peterbilt
- Product Type:
- Exterior
- Width Options:
- 2 1/2 Inch
- Ready To Ship:
- Yes
$226.99Qty in Cart: 0Price:$226.99Subtotal: -
Stainless Steel Front Air Cleaner Panels W/ Watermelon Light Holes For Peterbilt 389
VALLEY CHROME PLATING
$137.99Front Air Cleaner Panels With Light HolesBring a fresh look and dependable performance to your Peterbilt 389's front air cleaner with these Stainless Steel Panels featuring distinctive watermelon...01-0905419- SKU:
- 01-0905419
- Size Options:
- 16 Gauge
- Light Options:
- Without Lights
- Location:
- Made In USA
- Position:
- Front
- Product Type:
- Exterior
- Material Options:
- Stainless Steel
- Style Options:
- Watermelon
- Make:
- Peterbilt
$137.99Qty in Cart: 0Price:$137.99Subtotal: -
Roadworks Blank Stainless Steel Rear Air Cleaner Light Panel For Kenworth
ROADWORKS
$165.99Blank SS Rear Air Cleaner Light Panel By Roadworks Fits KenworthAdd a bold, clean upgrade to your Kenworth with Roadworks Blank Stainless Steel Rear Air Cleaner Light Panels. Each panel is made from...02-0905401- SKU:
- 02-0905401
- Diameter Options:
- 13 Inch
- Material Options:
- Stainless Steel
- Style Options:
- Donaldson Style
- Location:
- Made In USA
- Product Type:
- Exterior
- Make:
- Universal Items
$165.99Qty in Cart: 0Price:$165.99Subtotal: -
FREE SHIPPING OVER $249
Steel 15 Inch Air Cleaner Mounting Strap For Peterbilt 378, 379, 388 & 389
UNITED PACIFIC
$61.99SS Peterbilt 15 Inch Air Cleaner Mounting StrapMount a 15-inch air cleaner on your Peterbilt truck with this 1.5-inch wide strap. It is made of stainless steel and is sold individually.* High Quality...01-0905402- SKU:
- 01-0905402
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Peterbilt
- Product Type:
- Exterior
- Ready To Ship:
- Yes
- Width Options:
- 1 1/2 Inch
- Diameter Options:
- 15 Inch
$61.99Qty in Cart: 0Price:$61.99Subtotal: -
Stainless Steel Rear Air Cleaner Light Panel W/ Holes For M3 Light, 20 X 5 Inch For Peterbilt 359, 379, 389 Flat Tops
TWELVE GAUGE
$131.99Peterbilt SS Rear Breather Light Bar W/ Light Holes By 12 GaugeMaximize your Peterbilt flat top's rear lighting capabilities with this durable Stainless Steel Rear Air Cleaner Light Panel. Designed...01-0905413- SKU:
- 01-0905413
- Height Options:
- 20 Inch
- Truck Class:
- Heavy Duty
- Position:
- Rear
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
- Product Type:
- Exterior
- Ready To Ship:
- Yes
$131.99Qty in Cart: 0Price:$131.99Subtotal: -
19.75 Inch Stainless Steel Rear Air Cleaner Panels W/ 12 M3 Light Holes For Peterbilt 300 Series
ROADWORKS
$164.9919.75 Inch Rear Air Cleaner Panels W/ Light HolesElevate your Peterbilt's rear breather lighting with this set of high-quality Stainless Steel Rear Air Cleaner Panels, perfectly sized at 19.75 inches...01-0905416- SKU:
- 01-0905416
- Height Options:
- 19 1/2 Inch
- Material Options:
- Stainless Steel
- Light Options:
- Without Lights
- Position:
- Rear
- Location:
- Made In USA
- Product Type:
- Exterior
- Make:
- Peterbilt
$164.99Qty in Cart: 0Price:$164.99Subtotal: -
FREE SHIPPING OVER $249
Stainless Steel 15 Inch Air Cleaner Mounting Plate For Peterbilt 378, 379, 388 & 389
UNITED PACIFIC
$82.99SS Peterbilt Air Cleaner Mounting PlateThis high-quality air cleaner mounting plate by United Pacific is made of stainless steel. It fits a 15-inch air cleaner and is sold individually.* High Quality...01-0905401- SKU:
- 01-0905401
- Length Options:
- 15 Inch
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Peterbilt
- Product Type:
- Exterior
- Ready To Ship:
- Yes
$82.99Qty in Cart: 0Price:$82.99Subtotal: -
Rear Air Cleaner Light Bar With 12 LEDs For Peterbilt 379
TRUX ACCESSORIES
$234.99Rear Air Cleaner Light Bar With 12 LEDsOutfit your Peterbilt 379 with this durable Rear Air Cleaner Light Bar, equipped with 12 bright LEDs that provide enhanced illumination to the rear of your...01-0905420- SKU:
- 01-0905420
- Product Type:
- Frame & Chassis
$234.99Qty in Cart: 0Price:$234.99Subtotal: -
Stainless Steel Front Air Cleaner Panel W/ 16 Light Holes, 22 X 5 Inch For Peterbilt 359, 379, 389 Flat Tops
TWELVE GAUGE
$132.99Peterbilt Flat Top SS 22 Inch Front Breather Bar W/ Holes For M3 LightsGive your Peterbilt 359, 379, or 389 flat top a functional lighting upgrade with this durable Stainless Steel Front Air Cleaner...01-0905412- SKU:
- 01-0905412
- Position:
- Front
- Height Options:
- 22 Inch
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
- Finish Options:
- Polished
- Product Type:
- Exterior
- Light Options:
- Without Lights
- Width Options:
- 5 Inch
$132.99Qty in Cart: 0Price:$132.99Subtotal: -
Intake Pre-Filter For LAF3551 Air Filter
FREEDOM AIR FILTERS
$76.99Intake Pre-Filter For P153551 Air Filter* High Quality Polyester Mesh Pre-Filter* This Is A Pre-Filter Wrap That Covers The Air Filter Element. Air Filter Element Not Included. Sold Separately.* Fits...09-0723000- SKU:
- 09-0723000
- Truck Class:
- Heavy Duty
- Make:
- Freightliner
- Make:
- Western Star
- Make:
- Kenworth
- Make:
- Peterbilt
- Product Type:
- Engine Parts
$76.99Qty in Cart: 0Price:$76.99Subtotal: -
1-Piece Stainless Steel Diesel Particulate Filter Replaces 21905492, 85001353 For Mack/Volvo MP7/MP8 Engines
GLOBAL EMISSIONS
$2,070.991-Piece Stainless Steel Diesel Particulate Filter Fits Mack/Volvo MP7 & MP8 Engines* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For...29-080600031- SKU:
- 29-080600031
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Make:
- Volvo
- Make:
- Mack
- Product Type:
- Exhaust
$2,070.99Qty in Cart: 0Price:$2,070.99Subtotal: -
FREE SHIPPING OVER $249
Interior Fresh Air Filter For Peterbilt
CAB FRESH FILTER CO.
$22.07Peterbilt Interior Fresh Air Filter AssemblyKeep the inside of your cab fresh with this aftermarket interior filter from CAB Fresh. This filter features internal antimicrobials that stops mold...01-1503026- SKU:
- 01-1503026
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Material Options:
- Cloth
- Make:
- Peterbilt
- Product Type:
- Interior
- Ready To Ship:
- Yes
$22.07Qty in Cart: 0Price:$22.07Subtotal: -
FREE SHIPPING OVER $249
Pre-Filter For Air Cleaner For Kenworth & Peterbilt
CAB FRESH FILTER CO.
$33.71Pre-Filter For Air Cleaner Fits Kenworth & PeterbiltWe offer aftermarket CAB Fresh pre-filters for air cleaners that fits Kenworth T680, T880, Peterbilt 567 and 579 big rigs. It features activated...29-0905708- SKU:
- 29-0905708
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Material Options:
- Cloth
- Make:
- Peterbilt
- Make:
- Kenworth
- Product Type:
- Exterior
- Ready To Ship:
- Yes
$33.71Qty in Cart: 0Price:$33.71Subtotal: -
FREE SHIPPING OVER $249
Interior Fresh Air Filter Assembly For Peterbilt
CAB FRESH FILTER CO.
$46.91Peterbilt Fresh Air Filter AssemblyFind aftermarket interior filters with assembly from CAB Fresh at 4 State Trucks. This filter features internal antimicrobials that stops mold growth, reduces odor...01-1503025- SKU:
- 01-1503025
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Cloth
- Make:
- Peterbilt
- Product Type:
- Interior
- Ready To Ship:
- Yes
$46.91Qty in Cart: 0Price:$46.91Subtotal: -
FREE SHIPPING OVER $249
Cab Fresh Filter Only For Freightliner Cascadia, Century, Columbia & Coronado
CAB FRESH FILTER CO.
$17.91Cab Fresh Filter Only Fits FreightlinerFind your Cab Fresh Replacement Filter at 4 State Trucks. The highly effective filter is made with a primary layer and charcoal layer that traps and eliminates...03-091306- SKU:
- 03-091306
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Cloth
- Make:
- Freightliner
- Product Type:
- Exterior
$17.91Qty in Cart: 0Price:$17.91Subtotal: