Hillside Auto Repair

Hillside Auto Repair Loved by O'Fallon since 1985! 🚗 Hillside Auto Repair: The Professionals You Can Trust for expert service and honest advice.

All backed by a nationwide 3 yr/36k mile warranty. Your family deserves the best - we deliver!

Your GDI engine is basically a racehorse, but carbon buildup is the equivalent of stuffing cotton balls in its nostrils....
07/15/2026

Your GDI engine is basically a racehorse, but carbon buildup is the equivalent of stuffing cotton balls in its nostrils. Not pretty, right? 😬

That rough idle, that hesitation when you hit the gas, that mysterious drop in fuel economy? Yeah, that is carbon trying to ruin your day. At Hillside Auto Repair in O'Fallon, we have seen it all, and we know exactly how to kick that gunk to the curb using BG professional cleaners that actually work. No magic potions, just real chemistry and real dealership-level tools.

So before your engine starts coughing like a cat with a hairball, click the link and read our full blog post on why GDI engines need this cleaning and how we can save you from a very expensive repair bill. 👇

https://hillsideautomotiverepair.com/blog/how-carbon-build-up-affects-gdi-engines

Your engine will thank you. Probably with better gas mileage.

That moment you're cruising through O'Fallon, vibing to your playlist, and BAM – that little amber "ABS" light decides t...
07/14/2026

That moment you're cruising through O'Fallon, vibing to your playlist, and BAM – that little amber "ABS" light decides to crash the party. 🚗💥

It's not exactly the guest of honor you were hoping for. So, what do you do? Ignore it and hope it goes away? (Spoiler alert: It won't). 🛑

We broke down everything you need to know about that pesky light, why it might be on, and why waiting to fix it is like playing dodgeball with a semi-truck. 🤦‍♂️

Click the link to read our full blog post. Your brakes will thank you! 👇
https://hillsideautomotiverepair.com/blog/why-is-my-abs-light-on-is-it-dangerous

Is your car singing you the song of its people... but it sounds more like a dying robot whale? 🐋 That whining noise isn'...
07/13/2026

Is your car singing you the song of its people... but it sounds more like a dying robot whale? 🐋

That whining noise isn't a new "feature" from the factory; it is likely your fuel pump screaming for help!

🛑 Before you get stranded on Highway K, check out our latest blog post. We break down all the signs you need to watch for, why ignoring it is a terrible idea, and why you should leave the gas tank diving to the pros (we promise we are much better at it than you are).

Click the link to read the full story 👇
https://hillsideautomotiverepair.com/blog/the-silent-killer-of-your-engine-recognizing-a-failing-fuel-pump

and then tell us in the comments: Have you ever been stranded by a car issue, or did you catch it in time? Don't get left in the dust!

That clicking sound when you turn is not just annoying, it is your car screaming for help. Your CV axle is on its way ou...
07/07/2026

That clicking sound when you turn is not just annoying, it is your car screaming for help.

Your CV axle is on its way out and ignoring it is a gamble you do not want to take.

We lay out all the symptoms and explain why this is absolutely not a DIY job in our latest blog. O'Fallon drivers, we have the tools, the know-how, and a 3-year, 36,000-mile warranty to back it up.

Click the link and read up before that noise leaves you walking.

https://hillsideautomotiverepair.com/blog/the-cv-axle-the-link-that-keeps-you-moving

Thinking of buying a used car in O'Fallon? We love it! But do not let those rose-colored glasses blind you to a money pi...
07/06/2026

Thinking of buying a used car in O'Fallon? We love it!

But do not let those rose-colored glasses blind you to a money pit. At Hillside Auto Repair, we will give you the unvarnished truth about that perfect ride with our thorough pre-purchase inspection.

We will even provide photos and videos you can use to beat down the price. Plus, we have a notary to handle the boring paperwork.

Click the link below for the full story on why a PPI is your best friend. Do not get stuck with a lemon.

Click here for the full blog post! https://hillsideautomotiverepair.com/blog/the-unseen-truth-why-a-pre-purchase-inspection-is-your-best-friend

Fireworks, family, and four-wheel freedom. That’s what this week is all about. 🧨While everyone’s scrambling for a long w...
07/06/2026

Fireworks, family, and four-wheel freedom. That’s what this week is all about. 🧨

While everyone’s scrambling for a long weekend, we’re taking a different route. Hillside Auto Repair will be OPEN on July 3rd because we want to make sure your ride is road-trip ready, your A/C isn’t sweating harder than you are, and you don’t miss a single hot dog or flag wave at the family cookout.

Then on July 6th we’ll be closed. Not broken down, just celebrating our own traditions, chasing sparklers, and probably dodging a rogue bottle rocket or two.

So come see us on the 3rd. Let’s get you safely to the parades, the lake, and your uncle’s questionable BBQ brisket. We’ll catch up with our own family fireworks on the 6th.

Happy Independence Day, Hillside. Drive safe, aim fireworks away from the garage, and remember that liberty means choosing when to work and when to wave the flag. 🇺🇸🔧

Hillside Auto Repair (Closed 7/6. Open 7/3 for you.)

❤️🤍💙From the banks of the Mississippi to the Gateway to the West – God Bless America. ❤️🤍💙Here in O'Fallon, we know what...
07/04/2026

❤️🤍💙From the banks of the Mississippi to the Gateway to the West – God Bless America. ❤️🤍💙

Here in O'Fallon, we know what it means to be American. It means backyard barbecues with the smell of charcoal hanging in that humid Missouri air. It means kids running through sprinklers while the Cardinals game plays on the radio. ⚾️

This July 4th, we celebrate 250 years of freedom. 250 years of fighting for what's right. 250 years of ordinary people doing extraordinary things so we could gather in our driveways, watch the sky light up, and say with full hearts: "I'm proud to be an American." 🎆

At Hillside Auto Repair, we might work on everything from pickups to imports, because let's be honest, freedom means you can drive whatever you want! But our values are as Midwestern as they come: honest work, a firm handshake, and doing right by our community.

So this weekend, fire up that grill. Slather on the BBQ sauce. Crank up some classic rock. And when those fireworks boom over the Arch in the sky, take a moment to remember why we celebrate. 🎇

But here's the real talk, friends:
🍺 If you've been drinking, don't get behind the wheel. We want to see you back at Hillside for your next oil change, not sitting in a jail cell or worse. Call a friend. Call an Uber. Call your mom. Just drink responsibly.

🧨 And keep those little ones close around fireworks. They're magical, but they're also dangerous. One spark is all it takes. Let's make sure every kid wakes up July 5th with nothing but happy memories.

This is our country. Our home. Our 250th birthday.
Let's celebrate with big hearts, full plates, and a fierce love for this land we call free!

Happy Independence Day! We're proud to serve you. We're proud to be Americans. And we're honored to keep your wheels turning, no matter where they're from.

Fireworks, family, and freedom. Oh my. 🇺🇸Before you hit the road for the 4th, let's make sure your ride isn't the one co...
07/03/2026

Fireworks, family, and freedom. Oh my. 🇺🇸

Before you hit the road for the 4th, let's make sure your ride isn't the one coughing up a sparkler.

We will be open on July 3rd, the day before the big show, so you can get that last minute checkup, oil change, or "what's that noise?" fix. Because nothing says "independence" like not breaking down on the way to the BBQ. 🍔🚗

Be road ready. Drive with peace of mind. And leave the explosions to the sky.

Hillside Auto Repair – Keeping you rolling into the holiday like a patriot. 🔧

Torque gets you moving, Horsepower keeps you flying. Both need a hero to keep them alive. 🦸‍♂️ We just dropped a new blo...
07/01/2026

Torque gets you moving, Horsepower keeps you flying. Both need a hero to keep them alive. 🦸‍♂️

We just dropped a new blog breaking down the difference between these two engine specs and explaining which one actually matters for your daily O'Fallon commute.

Spoiler alert: it depends on how you drive! Click the link below to get the full breakdown and learn why keeping both in check is the real secret to a happy ride. 🚗💨 Don't be the person who only knows one half of the story. Hit that link and learn more👇

https://hillsideautomotiverepair.com/blog/horsepower-vs-torque-what-your-engine-s-numbers-really-mean

We gotta ask: When was the last time you had your powertrain checked? Drop your thoughts in the comments.

Address

400 Church Street
O'Fallon, MO
63366

Opening Hours

Monday 8am - 1pm
2pm - 5pm
Tuesday 8am - 1pm
2pm - 5pm
Wednesday 8am - 1pm
2pm - 5pm
Thursday 8am - 1pm
2pm - 5pm
Friday 8am - 1pm
2pm - 5pm

Telephone

+16362401050

Website

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