We’re in the business of making friends and making a difference.

We’re not just here to sell cars. Sure, you’ll find an outstanding selection of used vehicles on our dealership lot, but that’s far from our only mission at Quantum Auto Sales. To us, making friends means creating a welcoming environment and fostering a relationship where you don’t just become a customer, you become a friend. Have a great experience at Quantum Auto Sales? Leave us a review at any of the following websites below.

Review Garden Grove

Review Santa Ana

Review Escondido

Adeline and Meritiana Masaniai
1/22/2026

This place was my last resort and I’m glad they were because I was able to get a car even with having complications with my credit history. The staff is great, shout out to Cesar, Tito, boss man and the service area. 10/10 recommend this place to family and friends.

Abner Pineda
1/19/2026

I'm usually hesitant when it comes to buying things, but Gerardo and Eddie were so patient and kind throughout the whole process. They gave me great advice and answered all my questions transparently. Everything was very quick and easy, and they earned my trust. I recommend them 100%! 👌🏻

Hernan Cisneros
1/14/2026

They really do treat you well; they're very kind and friendly. They'll definitely help you get the car you want. You arrive with no car and leave with your new one.

giovanni a
1/13/2026

Gerardo and Adel were excellent in getting me into my Hybrid Camry thank you

fluf lust
1/12/2026

Mikey was able to help me with a walk in sale today and had amazing customer service. I was able to explain to him my situation and help me out.

Hector Herrera
1/12/2026

Mikey help was wonderful it was good help thanks for the help 🙂

Martha Fonseca
1/10/2026

Mickey was Amazing! He was so so helpful! And got me into the car I wanted! Definitely recommend this place 100%!!!!

Aida Lara
1/9/2026

Higinio, thank you very much.

Austin Scheiwe
1/6/2026

Mikey helped us — he was so kind and personable and knowledgeable. We really enjoyed our experience buying a car from him. Thanks also to Gerardo and Eddie for your assistance.

E M
1/1/2026

I appreciate the excellent service from Tony González! He's like the Tony Montana of cars. Thanks, Tony, for your service and advice!

Sol Martinez Lopez
12/31/2025

Aaron treated me very well; he provided excellent service.

Gustavo Alonso Lizarraga Gonzalez
12/31/2025

Ask for Aaron, he's a good salesman

ERIKA PATRICIA MENESES VAZQUEZ
12/31/2025

Excelente atención de Tony González nos dió toda la información que necesitábamos para tomar la mejor decisión. Gracias Tony!

VARGAS FRAGOSO XIMENA
12/31/2025

Excelente servicio de Tony González

Diana Vanessa Loya
12/31/2025

Excelente servicio que nos brindó Tony, muchas gracias por todo 🙌