Auto Maintenance and Auto Repair

At HIS Auto LLC in Oconomowoc, WI, we service all makes and models of vehicles to ensure the widest range of customer needs are met. Our full-service auto repair center offers everything from routine maintenance like oil changes, tire rotations, and fluid service to more involved repairs including radiator and transmission service, engine work, exhaust repairs, and electrical diagnostics. We use the latest automotive technology and ASE-certified technician expertise to accurately diagnose and repair your vehicle. Whether it’s a daily commuter, family SUV, or light truck, we provide reliable care to keep your car running safely and efficiently. Our focus on quality, fair pricing, and transparent communication means you’ll always know what maintenance or auto repair in Delafield, WI your vehicle needs and why.

When you bring your vehicle to HIS Auto LLC, we start with a comprehensive diagnostic process using advanced diagnostic tools designed to pinpoint the root cause of issues quickly and accurately. This includes reading check engine light codes, testing electrical systems, and inspecting critical components such as brakes, suspension, belts, hoses, and exhaust systems. By diagnosing the exact issue, we avoid unnecessary services and save you time and money down the road. Our technicians explain findings clearly and work with you to determine the best and most cost-effective solution for your vehicle’s health and safety. We pride ourselves on offering honest advice backed by decades of experience and industry-leading repair standards.

Routine maintenance is essential for keeping your vehicle running smoothly and preventing costly auto repair in Delafield, WI over time. At HIS Auto LLC, we handle standard services like oil changes, tire rotations and flat tire repair, battery inspection and replacement, and fluid checks to ensure your vehicle is in peak condition. Regular maintenance helps maximize engine performance, extend tire life, improve fuel efficiency, and uphold your vehicle’s resale value. Our ASE-certified technicians perform these services with precision and care, backed by our 1-year parts and labor warranty on most products. As a locally owned and family-run shop, we treat your vehicle like our own and schedule services that align with your routine.

A check engine light can indicate a wide range of issues — from minor sensor problems to more serious engine and emissions concerns. If your check engine light comes on, bring your car to HIS Auto LLC as soon as possible. Our experienced mechanics use up-to-date diagnostic equipment to read the trouble codes and determine the exact cause. Timely diagnosis prevents minor issues from becoming major, more costly repairs, helps maintain optimal fuel economy, and ensures your vehicle meets emissions standards. After diagnosing the problem, we’ll explain what’s going on in clear terms and recommend a course of action that’s right for your car and budget. Addressing this warning early helps protect your vehicle’s performance and longevity.

Yes! Part of our auto repair in Delafield, WI includes comprehensive cooling system and radiator services to help prevent your engine from overheating and suffering severe damage. Cooling system maintenance might include radiator flush and coolant replacement, leak detection and repair, thermostat testing and replacement, water pump inspection, hose and belt checks, and cooling fan diagnosis. A properly functioning cooling system is vital for engine health, performance, fuel efficiency, and avoiding breakdowns. Our technicians perform careful inspections and offer honest recommendations tailored to your vehicle’s condition.

Absolutely. We provide full exhaust system services to ensure your vehicle runs quietly and efficiently while reducing harmful emissions. This includes exhaust inspections, leak repair, catalytic converter replacement, muffler installation or replacement, and exhaust manifold services. Regular exhaust system care can improve fuel economy, enhance engine performance, and reduce environmental impact. Our ASE-certified technicians perform thorough inspections to catch issues early before they escalate into costly repairs. We also offer convenient drop-off service so you can fit maintenance into your schedule easily. Quality service and transparent communication are part of how we help you keep your car’s exhaust and emissions systems performing at their best.

At HIS Auto LLC, we stand behind our work with a commitment to customer satisfaction. Most of the parts and labor we provide are backed by a 1-year parts and labor warranty, giving you peace of mind that the repairs we perform are dependable and long-lasting. As a family-owned and locally operated shop specializing in auto repair in Delafield, WI with decades of experience, we focus on honesty, excellent communication, and fair pricing. Whether you need routine maintenance, complex repairs, or a detailed diagnostic inspection, our team keeps you informed throughout the process and answers your questions clearly.

Regular vehicle inspections play a key role in preventing unexpected breakdowns and costly repairs. At HIS Auto LLC, we encourage proactive inspections because they allow our technicians to identify small issues before they turn into major problems. During an inspection, we examine critical systems such as brakes, steering and suspension, belts and hoses, fluids, battery condition, tires, and warning lights. Catching worn components, leaks, or failing parts early helps improve safety, reliability, and overall vehicle performance. Routine inspections also give you a clearer picture of your vehicle’s condition, so you can plan maintenance rather than being surprised by sudden failures. Our ASE-certified technicians provide honest feedback and explain any findings in plain language, allowing you to make informed decisions.