- THE EXTRA MILE: The Maintenance Secret Most Dealerships Never Mention. (3-14-26)

Modern engines are more powerful, efficient, and technologically advanced than ever before—but are drivers unknowingly setting themselves up for expensive repairs? In this episode of https://Drive-Radio.com – The Extra Mile, John Rush takes a deep dive into the technology behind direct-injection (GDI) engines and turbochargers, explaining how modern vehicles squeeze incredible power and efficiency from smaller engines. John walks listeners through the evolution of fuel systems—from carburetors to throttle-body injection, port injection, and today’s direct-injection engines that inject fuel directly into the combustion chamber. While this design improves horsepower, fuel economy, and emissions performance, it also introduces new challenges—especially carbon buildup on intake valves that can impact performance as early as 40,000–60,000 miles. Why are many drivers never told about the maintenance these engines require? John explains how top-tier fuel, shorter oil change intervals, high-quality filters, and proper additives can dramatically reduce long-term problems. He also reveals why neglecting maintenance on modern engines can lead to drivability issues, rough idle, reduced fuel economy, or costly repairs. The episode then shifts to turbocharging, explaining how exhaust-driven compressors force more air into an engine to produce greater power. But with turbochargers spinning at up to 250,000 RPM and operating under extreme heat, proper lubrication and maintenance become even more critical. If you own—or are thinking about buying—a modern turbocharged or direct injection vehicle, this episode offers practical insights that could save you thousands of dollars and extend the life of your engine.