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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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FREE SHIPPING OVER $249
CSM SS 13 Inch Air Cleaner Wrap With Oval Hole For Peterbilt & Kenworth
CHROME SHOP MAFIA
$99.99Stainless Steel Air Cleaner Wrap With 13 Inch Donaldson Air Cleaner Fits Peterbilt & Kenworth By Chrome Shop Mafia* High Quality Air Cleaner Wrap* 13 Inch* With Oval Hole* Sold Individually* Warranty...29-090580- SKU:
- 29-090580
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Peterbilt
- Make:
- Kenworth
- Product Type:
- Exterior
- Height Options:
- 13 Inch
- Ready To Ship:
- Yes
$99.99Qty in Cart: 0Price:$99.99Subtotal: -
CSM SS 15-Inch Air Cleaner Wrap With Oval Hole For Kenworth & Peterbilt
CHROME SHOP MAFIA
$102.99Stainless Steel Air Cleaner Wrap With 15 Inch Air Cleaner Fits Peterbilt & Kenworth By Chrome Shop Mafia* High Quality Air Cleaner* 15 Inch* With Oval Hole* Sold Individually* Warranty On Air Cleaner...29-090581- SKU:
- 29-090581
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Make:
- Kenworth
- Make:
- Peterbilt
- Product Type:
- Exterior
$102.99Qty in Cart: 0Price:$102.99Subtotal: -
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: -
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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: -
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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: -
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Air Filter Assembly For HVAC For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$38.75Air Filter Assembly Fits Peterbilt & KenworthAt 4 State Trucks we offer aftermarket CAB Fresh air filter assemblies for Peterbilt 567 and 579 models, and Kenworth T680 and T880 models. The air filter...29-1503002- SKU:
- 29-1503002
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Material Options:
- Cloth
- Make:
- Peterbilt
- Make:
- Kenworth
- Product Type:
- Interior
- Ready To Ship:
- Yes
$38.75Qty in Cart: 0Price:$38.75Subtotal: -
FREE SHIPPING OVER $249
Air Filter Assembly For HVAC No Housing For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$14.27Air Filter Assembly Fits Peterbilt & KenworthWe offer aftermarket CAB Fresh air filter assemblies for Peterbilt 567 and 579 models, and Kenworth T680 and T880 models. The air filter is only for HVAC...29-1503003- SKU:
- 29-1503003
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Cloth
- Make:
- Kenworth
- Make:
- Peterbilt
- Product Type:
- Interior
- Ready To Ship:
- Yes
$14.27Qty in Cart: 0Price:$14.27Subtotal: -
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Black Plastic Cab Fresh Filter For Freightliner Cascadia, Century, Columbia & Coronado
CAB FRESH FILTER CO.
$51.99Cab Fresh Filter Fits FreightlinerReplace your original filter with this cab fresh filter with a charcoal spor-ax antimicrobial layer. This charcoal layer has adsorption properties that help capture...03-091305- SKU:
- 03-091305
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Plastic/Poly
- Make:
- Freightliner
- Color:
- Black
- Product Type:
- Exterior
$51.99Qty in Cart: 0Price:$51.99Subtotal: -
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Interior Cab Fresh Air Filter Replacement For Peterbilt 377, 378, 379 & 385
CAB FRESH FILTER CO.
$43.85Peterbilt Interior Cab Fresh Air FilterThis air filter fits under the dashboard on the passenger side. Simply slide the filter into the existing track next to the passenger door. It replaces the...01-1503017- SKU:
- 01-1503017
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Cloth
- Make:
- Peterbilt
- Product Type:
- Interior
- Ready To Ship:
- Yes
$43.85Qty in Cart: 0Price:$43.85Subtotal: -
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Cab Fresh Replacement HVAC Pre-Filter For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$14.27Air Filter HVAC Pre-FilterKeep your HVAC system running clean and efficient with this replacement pre-filter designed to fit inside the existing housing assembly. It helps capture dust, debris, and...29-091301- SKU:
- 29-091301
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Make:
- Kenworth
- Ready To Ship:
- Yes
- Product Type:
- Interior
$14.27Qty in Cart: 0Price:$14.27Subtotal: -
FREE SHIPPING OVER $249
Cab Fresh HVAC Pre-Filter W/ Black Housing For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$50.99Air Filter HVAC Pre-FilterHelp protect your cab's HVAC system with this complete pre-filter assembly featuring a durable housing and replaceable filter element. Designed to capture dust, debris, and...29-091300- SKU:
- 29-091300
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Make:
- Kenworth
- Make:
- Peterbilt
- Product Type:
- Engine Parts
- Ready To Ship:
- Yes
$50.99Qty in Cart: 0Price:$50.99Subtotal: -
Air Intake Pre - Filter For Side Of Hood For Volvo VNL Gen I 1998 - 2003
FREEDOM AIR FILTERS
$52.99Air Intake Pre-Filter On Side Of Hood Fits Volvo VNL Version 1 1997-2003Increase the efficiency of your filters by keeping them clean longer. This quality air intake pre-filter deflects large debris...13-12318- SKU:
- 13-12318
- Truck Class:
- Heavy Duty
- Color:
- Black
- Material Options:
- Plastic/Poly
- Make:
- Volvo
- Product Type:
- Hood Parts & Acc.
$52.99Qty in Cart: 0Price:$52.99Subtotal: -
FREE SHIPPING OVER $249
Interior Cab Fresh Air Filter For Peterbilt 330, 335, 340, 357, 367, 377, 378, 379, 385 & 386
CAB FRESH FILTER CO.
$46.73Peterbilt Cab Fresh Air FilterThis air filter is easy to install under the dash. Just slide it into the existing OEM track located by the passenger door. Follow these simple steps, and you'll have it...01-1503018- SKU:
- 01-1503018
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Cloth
- Make:
- Peterbilt
- Product Type:
- Interior
- Ready To Ship:
- Yes
$46.73Qty in Cart: 0Price:$46.73Subtotal: -
FREE SHIPPING OVER $249
Chrome Hood Air Intake Pre-Filter For Volvo VNL Gen II
CAB FRESH FILTER CO.
$192.99Air Intake Pre-Filter On Hood Fits Volvo VNL 2004-2018Looking to upgrade your Volvo VNL? Check out these chrome pre-filters for hood air intakes. They fit models from 2004 to 2018 and slip right over...13-12305- SKU:
- 13-12305
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Plastic/Poly
- Make:
- Volvo
- Finish Options:
- Chrome-Plated
- Product Type:
- Hood Parts & Acc.
$192.99Qty in Cart: 0Price:$192.99Subtotal: -
FREE SHIPPING OVER $249
FS1040 Fuel Filter Cummins ISX
OPP - ORIGINAL PARTS PROGRAM
$59.99FS1040 Fuel Filter Cummins ISX* High Quality Fuel Filter* Sold Individually* Warranty On Fuel Filter Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket...FS1040FLG- SKU:
- FS1040FLG
- Truck Class:
- Universal
- Make:
- Universal Items
- Product Type:
- Engine Parts
- Ready To Ship:
- Yes
$59.99Qty in Cart: 0Price:$59.99Subtotal: -
On SaleFREE SHIPPING OVER $249Limited Quantity Available
Chrome AC Heater Filter Door For Peterbilt
UNITED PACIFIC
Now: $21.74Was: $31.06Air Filter Door Fits Peterbilt* High Quality Filter Door* Made Of Chrome Plated Plastic* Sold Individually* Warranty On Filter Door Against Defects In Workmanship & Material From Date Of...01-1503015- SKU:
- 01-1503015
- Truck Class:
- Heavy Duty
- Material Options:
- Plastic/Poly
- Make:
- Peterbilt
- Finish Options:
- Chrome-Plated
- Product Type:
- Interior
- Ready To Ship:
- Yes
Now: $21.74Was: $31.06Qty in Cart: 0Price:Now: $21.74Was: $31.06Subtotal: -
FREE SHIPPING OVER $249
Fleetguard Fuel Filter 3406 A-B
OPP - ORIGINAL PARTS PROGRAM
$23.39Fleetguard Fuel Filter 3406 A-B* High Quality Fuel Filter* Sold Individually* Fits Many Makes And Models Of Trucks* Warranty On Fuel Filters Against Defects In Workmanship & Material From Date Of...FF5264FLG- SKU:
- FF5264FLG
- Truck Class:
- Universal
- Make:
- Universal Items
- Product Type:
- Engine Parts
$23.39Qty in Cart: 0Price:$23.39Subtotal: -
FREE SHIPPING OVER $249
Caterpillar 1R0716 Spin-On Oil Filter
OPP - ORIGINAL PARTS PROGRAM
$49.31Caterpillar 1R0716 Oil Filter* High Quality Oil Filter* Spin-On Filter* Efficiency Rating: Standard Efficiency* Height 307MM* Installation Type: Spin-On* Diameter / Length: 135.8MM* Media Type:...1R0716- SKU:
- 1R0716
- Truck Class:
- Universal
- Location:
- Made In USA
- Make:
- Universal Items
- Product Type:
- Engine Parts
- Ready To Ship:
- Yes
$49.31Qty in Cart: 0Price:$49.31Subtotal: