STG Auto Group of Ontario

STG Auto Group of Ontario We are Inland Empire's premier used car dealership. Explore and choose from over 1,600 quality vehicl

STG Auto Group should be your first stop when you're looking at used cars for sale in LA County, Orange County, and Inland Empire. We make it easy to explore our high-volume and high-quality pre-owned car inventory from all over California. And don't hesitate to schedule an appointment at our car repair center or meet with our auto finance experts!

06/27/2026

2022 Mercedes-Benz E 53 AMG — luxury, power, and style all in one. Available now at STG Auto Group. 🔥

06/27/2026

Why run around when you can do it all in one place? Huge selection. Multiple locations. Real options. STG Auto Group — One stop. Done right. 🚗

Twin energy, different fuel. ⚡️ The Mercedes-AMG GLC 43 🔥 meets the Cadillac Optiq 🔋 at STG Auto Group. Two takes on lux...
06/27/2026

Twin energy, different fuel. ⚡️ The Mercedes-AMG GLC 43 🔥 meets the Cadillac Optiq 🔋 at STG Auto Group. Two takes on luxury, one lot. Come take your pick.

06/26/2026

Built for the wild. Ready for the streets. 2025 Ford Bronco just landed at STG Auto Group 🐎🔥

06/25/2026

Would you take the 2025 Genesis GV80 Prestige over a BMW X5? 👀 Don’t call it “just a Hyundai” till you sit in one.

The beast is here. 🐍🔥 2020 Ford Mustang Shelby GT500 — power, presence, and performance all in one machine. Available no...
06/25/2026

The beast is here. 🐍🔥 2020 Ford Mustang Shelby GT500 — power, presence, and performance all in one machine. Available now at STG Auto Group.

06/25/2026

Guarding the lot at STG Auto Group 🐉 Most dealerships have a sign. We have a bronze warrior slaying a dragon out front. Because when you do things right, you don't blend in — you stand watch. 🛡️ Stop by and see what we're guarding.

06/24/2026

Luxury, trucks, SUVs, off-road rides, and head-turning sports cars — STG Auto Group has it all in one place. Come see it, test drive it, and find exactly what you’re looking for. 🚗🔥

Two M legends. One showroom. The BMW M2 and M3 are bringing pure performance energy to STG Auto Group. ...
06/24/2026

Two M legends. One showroom. The BMW M2 and M3 are bringing pure performance energy to STG Auto Group.

06/23/2026

Precision, power, and presence. The 2024 BMW M3 Competition is built to steal the spotlight. Filmed at STG Auto Group.

Address

10477 Central Avenue
Montclair, CA
91763

Opening Hours

Monday 9am - 9pm
Tuesday 9am - 9pm
Wednesday 9am - 9pm
Thursday 9am - 9pm
Friday 9am - 9pm
Saturday 9am - 9pm
Sunday 9am - 9pm

Telephone

+19093085431

Website

Alerts

Be the first to know and let us send you an email when STG Auto Group of Ontario posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to STG Auto Group of Ontario:

Shortcuts

Share

Category