(909) 437-9514


Welcome to

GSS Auto Repair

Call Now For An Appointment

(909) 437-9514

Monday - Friday: 8am- 5pm

Saturday: By Appointment

Sunday: Closed

Premium Automotive Service in Ontario, CA


If you’re looking for auto repair in Ontario, CA, you’ve found us. Here at Demo Automotive we work hard to earn your trust and loyalty. We know how important it is to find a car service you can rely on, so your satisfaction is our top priority each and every day.



We can take care of your vehicle from bumper to bumper.


We are able to find and repair your vehicle's electrical issues.


& Heating

Keep your vehicle cool during the summer months.

Check Engine light

When your vehicle tells you it needs an inspection, bring it to us.

8171 Sierra Ave Ste. C, Fontana, CA 92335, USA

12345, Ontario, CA, 98574


Drove up Sierra ave looking for a mechanic and I found who was more than glad to help me out, he is going to replace my front two lower control arms and axle, his price that he gave me after deducting a couple hours of labor was more than reasonable, a little more work than we thought so the car has to stay over night, roger offered me a ride home so I wouldn’t have to take an Uber I thought that cool of him so we’ll see you tomorrow..

Danny Barbosa


I don't normally leave reviews but felt I got Great service at GSS Auto Repair. He found the problem with my truck that nobody else could figure out. It turns out I needed a steering box, not only did he fix it, he went over the brakes checked all my fluids and belts to make sure I didn't have any problems down the road. He is now my new mechanic for all my vehicles. You can't go wrong with GSS Auto Repair. Thank You!

Thomas Williams


I Called GSS Auto Repair And Told Him My 2006 4-Runner Rear Brakes Were Metal To Metal. I Arrived Exactly 48 Minutes After The Call And He Had My Brake Pads And Rotors Ordered Already! He Had Me Done In 36 Minutes While I Waited! He’s Fast Efficient And Good At What He Does! I Really Appreciate That He Is An Honest Christian Too! I Highly Recommend GSS Auto Repair To All Who Reads My Review!

Andy Garcia


The Absolute Best Car Service in Ontario, CA

What sets Demo Automotive apart from all of the others in Ontario, CA?

Trust: When it comes to auto repair in Ontario, CA, it’s all about earning loyalty and trust by doing our very best every day. We are determined to earn and keep your trust.

Talent: At Demo Automotive, you can rest easy knowing that our highly-skilled, experienced auto service professionals are handling your car. Our technicians bring years of experience, skill, and education to each repair.

Time: We take the time we need to provide you with top quality car service in Ontario, CA, and we take the time to talk to you about what that means. We listen to you so we understand your needs and goals for your vehicle.

Gotz 10% Coupon

Click To Claim

Demo Automotive

We want to be your preferred auto repair provider

12345, Ontario, CA, 98574


(909) 437-9514


Monday - Friday: 8am- 5pm

Saturday: By Appointment

Sunday: Closed


Auto Electric

A/C Diagnostics

Belts & Hoses

Oil Changes

Check Engine Light

And Much More...

@ 2020 Copyright. All rights reserved.