The 4 State Trucks Blog

What are the best truck shows in America?  Over the years, we've visited them all at one point or another. Here's a full breakdown of what each U.S. truck show has to offer and how to choose the best one for 2027 and beyond.   Best Truck Shows to Visit in 2027 Your Main Goal Recommended Event Why Attend Attend Your First Formal Truck Show MATSMid-America Trucking Show Industry-leading convention with custom trucks, industry products, vendors, and educational sessions. D …

Some trucks are built to work. Some are built to show. Then there are trucks like Chad Smith’s 2019 Peterbilt—built to work, built to stand out and built with a story behind every detail. STS Transit has always been a fantastic cutomer and we were thrilled to do a walk around interview showing you his custom build. We have always been thrilled in working closely with Chad and his team helping to get parts to contribute to such a beauty of a truck. This is why we do what we do everyda …

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 for warning lights, frequent regens, poor acceleration, and rising fuel use. DPFs require both regeneration and physical cleaning due to ash accumulation. Sensors are vital—if they fail, the whole system can suffer. Proactive maintenance and driver training are your best defense. What …

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 year. New EPA emissions standards required manufacturers to reduce harmful soot particles from diesel exhaust. To meet these standards, truck manufacturers began installing DPF systems that trap and burn off soot before it leaves the exhaust. More changes followed in 2010, when stricter nitrogen oxid …

What Is a DEF (Diesel Exhaust Fluid) Filter? Diesel exhaust fluid filters are a non-toxic EPA-mandated solution to NOx emissions on selective catalytic reduction (SCR) systems. DEF filters: Diesel exhaust fluid = 32.5% urea + 67.5% deionized water. Urea/water mixture is sprayed into hot exhaust, turns to ammonia, and kills toxic NOx levels How DEF Helps Reduce Diesel Exhaust Emissions It's a toxic emission. The DEF (the water/urea mixture) sprays into your exhaust system and works as an aftert …