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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

    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

    Semi-Truck Mattress Sizes: Fitment Chart & Buying Guide(Post)

    Looking for the right sized semi truck mattress? Every long-haul trucker should prioritize spending a sizeable portion of their budget on a quality mattress and driver's seat. That's where you spend

    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

    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

    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

    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

    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

    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 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

    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

    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

    How to Buy the Right Peterbilt 379 Radiator(Post)

    If you want to keep your diesel engine from overheating you need a well-functioning replacement Peterbilt radiator to properly carry the hot coolant through small passages, transfer engine heat into t

    Why Drivers Trust MHC Kenworth for Uptime, Service, and Long-Term Support(Post)

    MHC Kenworth doesn't just sell heavy duty trucks and truckp parts, it prides itself in having the largest Kenworth dealer network, 130+ service locations across 19 states, 50 years of industry experie

    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. 

    What are Semi Truck Winter Fronts?(Post)

    A semi-truck winter front is a heavy-duty, weather-resistant cover designed to mount directly over a truck’s front grille. Typically manufactured from reinforced vinyl, canvas, or quilted fabric, it s

    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

    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

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  • FREE SHIPPING OVER $249
    Cab Fresh Filter Only For Freightliner Cascadia, Century, Columbia & Coronado

    Cab Fresh Filter Only For Freightliner Cascadia, Century, Columbia & Coronado

    CAB FRESH FILTER CO.

    $17.91
    Cab 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
    $17.91
    Qty in Cart: 0
    Price:
    $17.91
    Subtotal:
  • FREE SHIPPING OVER $249
    Black Plastic Cab Fresh Filter For Freightliner Cascadia, Century, Columbia & Coronado

    Black Plastic Cab Fresh Filter For Freightliner Cascadia, Century, Columbia & Coronado

    CAB FRESH FILTER CO.

    $51.99
    Cab 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
    $51.99
    Qty in Cart: 0
    Price:
    $51.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Cab Fresh Replacement HVAC Pre-Filter For Peterbilt & Kenworth

    Cab Fresh Replacement HVAC Pre-Filter For Peterbilt & Kenworth

    CAB FRESH FILTER CO.

    $14.27
    Air 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
    $14.27
    Qty in Cart: 0
    Price:
    $14.27
    Subtotal:
  • FREE SHIPPING OVER $249
    Cab Fresh HVAC Pre-Filter W/ Black Housing For Peterbilt & Kenworth

    Cab Fresh HVAC Pre-Filter W/ Black Housing For Peterbilt & Kenworth

    CAB FRESH FILTER CO.

    $50.99
    Air 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
    $50.99
    Qty in Cart: 0
    Price:
    $50.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300033 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300033 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300033* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300035
    SKU:
    29-071300035
    Truck Class:
    Heavy Duty
    Make:
    International
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300044 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300044 High Performance Air Filter

    FLEET FILTERS

    $112.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300044* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300045
    SKU:
    29-071300045
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $112.99
    Qty in Cart: 0
    Price:
    $112.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300022 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300022 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300021* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300023
    SKU:
    29-071300023
    Truck Class:
    Heavy Duty
    Make:
    Sterling
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300027 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300027 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300027* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300029
    SKU:
    29-071300029
    Truck Class:
    Heavy Duty
    Make:
    Mack
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300042 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300042 High Performance Air Filter

    FLEET FILTERS

    $112.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300042* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300043
    SKU:
    29-071300043
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $112.99
    Qty in Cart: 0
    Price:
    $112.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300039 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300039 High Performance Air Filter

    FLEET FILTERS

    $112.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300039* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300040
    SKU:
    29-071300040
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $112.99
    Qty in Cart: 0
    Price:
    $112.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300018 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300018 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300018* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300020
    SKU:
    29-071300020
    Truck Class:
    Heavy Duty
    Make:
    Volvo
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300030 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300030 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300030* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300032
    SKU:
    29-071300032
    Truck Class:
    Heavy Duty
    Make:
    Volvo
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300004 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300004 High Performance Air Filter

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air FilterThe replacement air filter wrap for the 29-071300004 model features a 3-layer design that services one filter. The new wraps do not...
    29-071300006
    SKU:
    29-071300006
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300015 High Performance Air Filter For International 9000 Series & Peterbilt 348

    3 Layer Replacement Air Filter Wrap For 29-071300015 High Performance Air Filter For International 9000 Series & Peterbilt 348

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300015* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300017
    SKU:
    29-071300017
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300024 High Performance Air Filter For Kenworth & Peterbilt

    3 Layer Replacement Air Filter Wrap For 29-071300024 High Performance Air Filter For Kenworth & Peterbilt

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300024* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300026
    SKU:
    29-071300026
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300036 High Performance Air Filter For Freightliner Cascadia 116/126

    3 Layer Replacement Air Filter Wrap For 29-071300036 High Performance Air Filter For Freightliner Cascadia 116/126

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300036* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300038
    SKU:
    29-071300038
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300012 High Performance Air Filter For Ford, Freightliner & International

    3 Layer Replacement Air Filter Wrap For 29-071300012 High Performance Air Filter For Ford, Freightliner & International

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300012* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300014
    SKU:
    29-071300014
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300001 High Performance Air Filter For Freightliner, Mack & Peterbilt

    3 Layer Replacement Air Filter Wrap For 29-071300001 High Performance Air Filter For Freightliner, Mack & Peterbilt

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300001* 3 Layer Design* Do Not Come Pre-Oiled* Oil Is Required Before...
    29-071300003
    SKU:
    29-071300003
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Sterling

    High Flow Performance Air Filter With Washable Element Media For Sterling

    FLEET FILTERS

    $444.99
    High Performance Air Filter Media Fits SterlingYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable, high flow, air...
    29-071300021
    SKU:
    29-071300021
    Truck Class:
    Heavy Duty
    Make:
    Sterling
    Product Type:
    Engine Parts
    $444.99
    Qty in Cart: 0
    Price:
    $444.99
    Subtotal:
  • FREE SHIPPING OVER $249
    CAB Fresh Chrome Exterior Cab Air Filter Assembly W/ Hardware For Peterbilt 357, 377, 378, 379 & 386

    CAB Fresh Chrome Exterior Cab Air Filter Assembly W/ Hardware For Peterbilt 357, 377, 378, 379 & 386

    CAB FRESH FILTER CO.

    $43.85
    Exterior Cab Air Filter AssemblyThis Chrome Exterior Cab Air Filter Assembly is ideal for keeping your truck's cab air fresh. Just place it behind the hood latch on the outside passenger side. You...
    01-091303
    SKU:
    01-091303
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Interior
    Position:
    Passenger Side
    Finish Options:
    Chrome-Plated
    Ready To Ship:
    Yes
    $43.85
    Qty in Cart: 0
    Price:
    $43.85
    Subtotal:
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