O'Fallon Auto Repair

What Is a Catalytic Converter? A catalytic converter is a critical component in your vehicle’s exhaust system, designed to reduce harmful emissions. By converting toxic gases like carbon monoxide, nitrogen oxides, and unburned hydrocarbons into less harmful substances, it plays a vital role in protecting both the environment and public health. A Brief History Introduced in the 1970s amid growing environmental concerns, catalytic converters revolutionized automotive emissions control. Stricter government regulations mandated their use, significantly reducing air pollution and paving the way for cleaner air standards. How Do Catalytic Converters Work? Inside the converter, precious metals like platinum, palladium, and rhodium act as catalysts, triggering chemical reactions that transform harmful exhaust gases into safer compounds: Nitrogen oxides → Nitrogen & oxygen Carbon monoxide ... read more

Have you observed your vehicle experiencing hesitation, rough idling, or a noticeable decrease in performance? These issues are often caused by carbon deposits accumulating within the engine, potentially impacting its efficiency and operation. What Is Induction Cleaning? Induction cleaning, also known as fuel induction service or intake system cleaning , is a specialized maintenance procedure designed to remove harmful carbon deposits, varnish, and gunk from critical engine components. Over time, fuel injectors, intake valves, throttle bodies, and combustion chambers accumulate deposits that can hinder performance, reduce fuel efficiency, and even trigger check engine lights. This process involves using professional-grade chemical cleaners and specialized equipment to dissolve and flush out stubborn deposits, restoring optimal airflow and fuel delivery. Unlike basic fuel additives, a professional induction cleaning service ensures a thorough cleanse of the entire i ... read more

If you own a modern diesel vehicle, you’ve probably heard of Diesel Exhaust Fluid (DEF). But what exactly is it, why is it so important, and what happens if you ignore it? In this deep dive, we’ll cover everything from its composition to why you should *never* resort to peeing in the tank (yes, some people do that!). Plus, we’ll touch on maintenance tips and what happens when things go wrong. What Is DEF Fluid? DEF is a non-toxic, urea-based solution used in Selective Catalytic Reduction (SCR) systems to reduce harmful nitrogen oxide (NOx) emissions from diesel engines. It’s a clear, odorless liquid made of: - 32.5% high-purity urea - 67.5% deionized water When injected into the exhaust stream, DEF breaks down NOx emissions into harmless nitrogen and water vapor, making your diesel vehicle much cleaner and more environmentally friendly. Is DEF Toxic or Harmful? While DEF is not flammable or dangerously toxic, it is mildly ... read more

As summer temperatures soar, your engine works harder than ever—and the oil you use can mean the difference between smooth performance and costly repairs. While conventional oil gets the job done under normal conditions, synthetic oil is the clear winner when the heat is on. At Hillside Auto Repair, we’ve seen firsthand how synthetic oil helps engines survive brutal summer conditions. In this guide, we’ll break down why synthetic outperforms conventional oil in hot weather, how it protects your engine, and when it’s time for an oil change. Why Hot Weather Demands Better Oil Engines generate extreme heat, and summer driving only makes it worse. Stop-and-go traffic, towing, and long road trips push oil to its limits. Here’s what happens inside your engine when temperatures rise: ✔ Oil thins out – High heat breaks down conventional oil faster, reducing lubrication ✔ Sludge builds up – Cheap oil can leave harmful deposits in ... read more

As temperatures rise, your car’s cooling system faces its toughest challenge—preventing overheating under the scorching summer sun. Many drivers assume that water is enough to keep their engine cool, but the truth is far more complex. Using plain water instead of proper coolant (antifreeze) can lead to costly repairs, reduced engine life, and even sudden breakdowns. At Hillside Auto Repair, we’ve seen firsthand how neglecting cooling system maintenance can turn a summer road trip into a roadside disaster. In this guide, we’ll break down why coolant is superior to water, how your cooling system works in extreme heat, and the warning signs that your vehicle needs immediate attention. Why Water Alone Isn’t Enough for Your Engine Water might seem like a simple, cost-effective coolant, but it has major drawbacks: Water Boils Too Easily - Engines operate at 190–220°F, and in summer, under-hood temps can soar eve ... read more