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Dealers / Riverside, CA / Diamond Auto Exchange
Used car dealerColton, CA
A

Diamond Auto Exchange

Buyer's Guide grade A · 300 public reviews · September 2026

Diamond Auto Exchange earns an A. 300 public reviews average 4.7 stars and 6 percent are one or two stars. That ranks it above 77 percent of graded dealers around Riverside.

At a glance

  • Past buyers are close to unanimous. Few complaints across a long record.
  • Complaint share 6 percent, lower than the 11.5 percent typical near Riverside
  • Reviewers mention quick process most, in 24 reviews
  • Open Sundays · Used car dealer

Why It Got an A

The star average is 4.7 from 300 public reviews. After the grade pulls it toward the national average, it counts as 4.66. 6 percent of reviews are one or two stars. That clears every bar for an A. The adjusted rating is 4.6 or better, complaints are 8 percent or less, and the record has at least 50 reviews. How the grade works.

How the Stars Break Down

5 star272 91%
4 star9 3%
3 star1 0%
2 star2 1%
1 star16 5%

What Reviewers Talk About

The subjects that come up most in public reviews of this dealer, with how many reviews mention each one.

quick process 24respectful staff 24first car purchase 16no pressure sales 9free warranty 8low mileage cars 5reliable cars 5no haggle 4family owned business 4honest dealer 3

Reviews here bring up free warranty. A topic showing up does not say which way the review went, but those are the subjects that tend to surface after a sale goes badly. Have any car from this lot checked before you sign. What review words tell you.

Buying From Diamond Auto Exchange

Diamond Auto Exchange is an independent used car lot. Independent lots range from excellent to poor, and the car in front of you matters more than the sign out front. Ask whether the car is sold as is and read the Buyers Guide sticker in the window. What as is means.

Whatever the grade, the grade is about the dealer. The car is its own question. Ask the dealer if an independent inspection is allowed before you sign. A good lot says yes.

Dealer Details

Address1741 N Mt Vernon Ave, Colton, CA 92324
Phone909-533-4657
Websitediamondautoexchange.com
Listed featuresBuys vehicles, Sells used vehicles, Credit cards, Debit cards, Phone pay, Small business
TypeUsed car dealer

Hours

Monday9 AM to 6 PM
Tuesday9 AM to 6 PM
Wednesday9 AM to 6 PM
Thursday9 AM to 6 PM
Friday9 AM to 6 PM
Saturday9 AM to 6 PM
Sunday10 AM to 3 PM

Common Questions

Is Diamond Auto Exchange a good dealer?
Diamond Auto Exchange earns an A in the PPI Auto Buyer's Guide. Past buyers are close to unanimous. Few complaints across a long record. The grade reads 300 public reviews averaging 4.7 stars, with 6 percent at one or two stars. It rates past buyers' experience with the dealer, not any single car.
Can I get a car at Diamond Auto Exchange inspected before I buy?
Yes. PPI Auto sends an inspector to the car on the lot in Colton. You do not have to be there. The inspection covers 122 points, a full OBD-II scan with readiness monitors, a road test and photos of anything found, and the report comes the same day. Ask the dealer to hold the car while it is checked.
How is the grade worked out?
It needs 20 or more public reviews. The star average is pulled toward the national average by 25 average reviews so a short record cannot jump the line, and the share of one and two star reviews sets a ceiling. The full method is on our grading page.
Is Diamond Auto Exchange open on Sunday?
Its listed Sunday hours are 10 AM to 3 PM. Hours change, so call before you drive over.

Other Graded Dealers Nearby

Buyers Also Look At

Grades update when public reviews do. Is this your dealership and something here is out of date? Tell us. See every graded dealer in Riverside, CA. Found a car here? Book a pre purchase inspection in Riverside, CA before you sign.

Buying from this lot?

Inspect it on the lot

We check the car at Diamond Auto Exchange before you sign.

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Inspect a car at Diamond Auto Exchange

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Details

No payment now · We confirm scheduling before any work

The grade covers the dealer. We check the car.

122 points, a full scan and a road test, on the lot, same day report.

Call 951-267-8500