Improve Your Car's Performance

Great People. Great Products. Great Prices.

Proudly Serving Macon County since 1955

Since 1955, we’ve provided customers with excellent service and quality products.

Why Choose Us?

Donnelly Automotive Machine, Inc. is one of the leading auto part stores and machine shops in Decatur, IL. With experienced technicians and decades of industry experience, you can rely on our team to provide high-quality parts and machine upgrades to restore your vehicle. Here are just a few reasons why we are the #1 choice for residential and commercial vehicle owners in central Illinois.

Donnelly Automotive Machine - Auto Parts Warranties icon - Decatur, IL

Auto Part Warranties

Get manufacturer warranties on all of our auto parts, giving you total peace of mind for as long as you own your vehicle.

Donnelly Automotive Machine - combined experience icon - Decatur, IL

120+ Years of Combined Experience

Our employees have over 120 years of combined industry experience performing machine shop services and providing expert advice.

Donnelly Automotive Machine -High quality products icon - Decatur, IL

High-Quality Products

We work with name-brand manufacturers and industry experts to provide OEM form, fit, and function products. 

Your #1 Source for High-Quality Car Parts in Decatur, IL

Vehicles are more than just a convenient way to travel – they’re our lifeline to careers, family, and adventures that require professional care to last for decades. Donnelly Automotive Machine, Inc. is the leading truck and auto part shop in Decatur, IL, with over 120+ years of combined industry experience. Whether you need access to new car parts or your commercial vehicle requires serious machining services, our experts are here to help every step of the way. Our local shop offers reliable and affordable auto parts for domestic, imported, and heavy-duty vehicles in central Illinois. Give us a call today. 

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Auto Part Services

From simple replacement parts to engine rebuild projects, Donnelly Automotive Machine, Inc. offers a range of solutions for domestic and imported vehicles in Central Illinois.

Donnelly Automotive Machine - car maintenance supplies icon - Decatur, IL

Car Maintenance and Appearance Supplies

Keep your car clean inside and out with supplies for your vehicle maintenance project. It’s important to have high-quality cleaning supplies to keep your vehicle looking and performing its best.

Donnelly Automotive Machine - Domestic & imported vehicle parts icon - Decatur, IL

Domestic & Imported Vehicle Parts

Need a new part for your vehicle? Our auto parts store offers a full line of domestic and imported truck and car parts for all vehicle makes and models in Decatur, IL. You won’t find a better selection than ours at Donnelly Automotive Machine, Inc.

Domestic & Imported Auto Parts


Auto Machine Shop Services

About Our Company

Donnelly Automotive Machine, Inc. has been the leading auto parts store and machine shop for vehicle owners in Decatur, IL since 1955. With decades of industry experience, our team is trained to provide reliable machining services and high-quality auto parts for your domestic, imported, or heavy-duty vehicle. Our company is paired with Carquest Auto Parts, one of the largest manufacturers of replacement car parts in the industry. From passenger cars and light pick-up trucks to fleet and industrial vehicles, Donnelly has access to high-quality parts for any vehicle on the road.

Open Since 1955

Our team has over 120 years of combined experience, being the #1 choice for vehicle owners in Decatur, IL, and the surrounding area.

800,000 Top-Quality Auto Products

Donnelly Automotive Machine, Inc. works with Carquest to offer our customers over 800,000+ auto parts for their vehicle makes and models.

Carquest Auto Parts

Carquest Auto Parts works with local shops to provide high-quality parts and free battery testing.

Home-Town Service

Get home-town service with name-brand services and parts for your vehicle. At Donnelly, we have great people, great products, & great prices.

Open 6 Days a Week

Our shop in Decatur, IL is open six days a week for your convenience. We are proud to be the first choice for vehicle owners from 7:30 AM – 5:00 PM.

Excellent Customer Service

We are proud to offer excellent service to each one of our customers. Read through dozens of 5-star reviews from real customers in Decatur, IL.

Our Mission

At Donnelly Automotive Machine, Inc. our mission is to provide high-quality, long-lasting, and affordable car and truck repair parts to our customers. With trained and experienced professionals, you can have peace of mind knowing that your vehicle is in good hands.

Our store offers a range of repair parts and machine restoration services. From standard passenger car parts to industrial engine rebuilding, there’s nothing our team can’t do. Invest in a name you can trust when you visit Donnelly Automotive in Decatur, IL.

Popular Questions

Yes! All parts purchased at any CARQUEST Auto Parts store come with a manufacturer’s warranty that is covered for the life span of your vehicle. Learn more about our part warranties by giving us a call at 217.428.7414.

Yes! To accommodate our customer’s busy schedules, we are open on Saturdays from 7:30 AM – 1:30 PM for vehicle repairs and inspection services.

Donnelly Automotive Machine, Inc. in Decatur, IL offers a wide range of machine shop services for vehicle owners. With over 120+ years of combined experience, machinists can handle tasks such as degreasing blocks, bore and finish hone, mill blocks, line bore, installing cam bearings, cylinder head repair, valve jobs, connecting rod repair, flywheel resurfacing, and more. Learn more about our machine shop services by giving us a call at 217.428.7414.

Customer Testimonials

Browse through real reviews from our local customers in Decatur, IL. Donnelly Automotive Machine, Inc. is proud to offer excellent customer service, free estimates, and quality parts for all makes and models. See why we’re #1 for domestic and import vehicle services.