Best GMC Dealerships in Riverside-San Bernardino, Ranked by CarEdge Data

This is the CarEdge Dealer Transparency Index ranking for GMC dealers in the Riverside-San Bernardino metro. We graded every GMC dealer in the area with enough verified out-the-door quotes to score with confidence — using real PDFs, emails, and signed deals, not Google star ratings.

8 GMC dealers in Riverside-San Bernardino currently clear the data threshold. Here’s how they rank.

Last updated November 11, 2026. CarEdge refreshes these rankings daily as new verified out-the-door quotes come in.

What is the best GMC dealer in Riverside-San Bernardino?

The best GMC dealer in Riverside-San Bernardino by verified out-the-door price data is Caposio Buick Gmc (Victorville, CA): A grade, 100/100 across 15 quotes from the past year, with no quoted add-ons in its 15 quotes from the past year.

Close behind:

2. Penske Buick Gmc Of Cerritos (Cerritos), A grade, 100/100 across 4 quotes from the past year, with no quoted add-ons in its 4 quotes from the past year.
3. Reynolds Gmc (West Covina), A grade, 100/100 across 4 quotes from the past year, with no quoted add-ons in its 4 quotes from the past year.

Best for:

• Lowest dealer fees: Costa Mesa Gmc (Costa Mesa), $85, against the CA median of $117.
• No quoted add-ons: Caposio Buick Gmc (Victorville), none in its 15 quotes from the past year.
• Most quotes, past year: Caposio Buick Gmc (Victorville), 15 quotes from the past year behind its A.

Among the A and B dealers ranked on this page.

Full ranking, dealer fees and quoted add-ons for every graded dealer are below.

Top 8 GMC Dealers in Riverside-San Bernardino

Ranked by CarEdge transparency score, highest to lowest. Each dealer profile links to the full review with verified out-the-door quotes.

#1 — Caposio Buick Gmc

Grade: A · Score: 100/100 · Victorville, CA

Caposio Buick Gmc is the top-graded GMC dealer in the Riverside-San Bernardino metro by verified data — A grade, 100/100, based on 15 quotes from the past year.

• Dealer fees: $122 — above the CA median of $117
• Quoted add-ons: None in 15 quotes from the past year
• Quotes, past year: 15

See full review & verified quotes →

#2 — Penske Buick Gmc Of Cerritos

Grade: A · Score: 100/100 · Cerritos, CA

Penske Buick Gmc Of Cerritos put no quoted add-ons on any of its 4 quotes from the past year — rare for an A-grade GMC dealer.

• Dealer fees: $122 — above the CA median of $117
• Quoted add-ons: None in 4 quotes from the past year
• Quotes, past year: 4

See full review & verified quotes →

#3 — Reynolds Gmc

Grade: A · Score: 100/100 · West Covina, CA

Not one of Reynolds Gmc’s 4 quotes from the past year carried a quoted add-on — a clean record at the A grade.

• Dealer fees: $122 — above the CA median of $117
• Quoted add-ons: None in 4 quotes from the past year
• Quotes, past year: 4

See full review & verified quotes →

#4 — Costa Mesa Gmc

Grade: A · Score: 98/100 · Costa Mesa, CA

Costa Mesa Gmc put quoted add-ons on just 20% of its quotes from the past year — light for an A-grade dealer.

• Dealer fees: $85 — below the CA median of $117
• Quoted add-ons: On 2 of 10 quotes from the past year (20%)
• Quotes, past year: 10

See full review & verified quotes →

#5 — Hardin Buick Gmc

Grade: A · Score: 90/100 · Anaheim, CA

Quoted add-ons showed on only 15% of Hardin Buick Gmc’s quotes from the past year — restrained by segment standards.

• Dealer fees: $131 — above the CA median of $117
• Quoted add-ons: On 2 of 13 quotes from the past year (15%)
• Quotes, past year: 13

See full review & verified quotes →

#6 — Thorson Motor Center

Grade: B · Score: 89/100 · Pasadena, CA

Thorson Motor Center earns a solid B on verified data — dealer fees at or below the CA median. The one watch-out: quoted add-ons show on 38% of its quotes from the past year.

• Dealer fees: $85 — below the CA median of $117
• Quoted add-ons: On 3 of 8 quotes from the past year (38%)
• Quotes, past year: 8

See full review & verified quotes →

#7 — Laguna Niguel Gmc

Grade: B · Score: 88/100 · Laguna Niguel, CA

Laguna Niguel Gmc grades a B: dealer fees at or below the CA median, but quoted add-ons show on 75% of its quotes from the past year — ask for an itemized OTD.

• Dealer fees: $85 — below the CA median of $117
• Quoted add-ons: On 3 of 4 quotes from the past year (75%)
• Quotes, past year: 4

See full review & verified quotes →

#8 — Tustin Buick Gmc

Grade: C · Score: 73/100 · Tustin, CA

Tustin Buick Gmc grades a C — quoted add-ons appear on 100% of its quotes from the past year. Ask for an itemized OTD before signing.

• Dealer fees: $85 — below the CA median of $117
• Quoted add-ons: On 5 of 5 quotes from the past year (100%)
• Quotes, past year: 5

See full review & verified quotes →

Limited Data

These GMC dealers in the Riverside-San Bernardino metro have verified OTD data, but not yet enough quotes from the past year to rank. We’re actively collecting more quotes for these dealers.

• Cerritos Auto Square (Cerritos, CA) — based on 2 quotes from the past year. View dealer page
• Socal Penske Dealer Group (City of Industry, CA) — based on 2 quotes from the past year. View dealer page
• Glendora Auto Mall (Glendora, CA) — based on 1 quote from the past year. View dealer page
• Simpson Buick Gmc Of Buena Park (Buena Park, CA) — based on 1 quote from the past year. View dealer page
• Temecula Valley Buick Gmc (Temecula, CA) — based on 1 quote from the past year. View dealer page
• Riverside Auto Center (Riverside, CA) — based on 2 quotes from the past year. View dealer page
• Tustin Auto Center (Tustin, CA) — based on 2 quotes from the past year. View dealer page
• Boulevard Gmc (Signal Hill, CA) — based on 3 quotes from the past year. View dealer page
• Hatfield Buick Gmc (Redlands, CA) — based on 3 quotes from the past year. View dealer page

About the CarEdge Dealer Transparency Index

Most dealer rankings come from Google star ratings and Yelp reviews — easy to game, impossible to verify. The CarEdge Dealer Transparency Index is different. We score every dealer using verified out-the-door quotes: real PDFs, emails, and screenshots from actual transactions.

Only quotes from the past year count. We split them into four groups, newest first: the newest counts 50%, then 30%, 15% and 5%.

Each dealer’s transparency score (out of 100) is weighted across four dimensions:

• Fee Transparency (30%) — Are the dealer’s fees reasonable? We add up every dealer fee and compare the total with the state median.
• Add-on Behavior (30%) — How often does the dealer include quoted add-ons like paint protection or theft deterrent, the kind you can’t say no to? Add-ons the dealer marks as optional don’t count against them.
• Price Accuracy (30%) — Does the advertised price include every charge you have to pay? We check each quote against the vehicle page: dealer fees, add-ons, the advertised price and the discount.
• Data Quality (10%) — Does the quote list taxes, dealer fees, add-ons and government fees each on its own line? Each one is worth a quarter.

Grades: A (90–100), B (80–89), C (70–79), D (60–69), F (below 60). Read the methodology →

Riverside-San Bernardino GMC Dealer Rankings at a Glance

#	Dealer	City	Grade	Score	Dealer Fees	Quoted Add-ons	Quotes, Past Year
1	Caposio Buick Gmc	Victorville	A	100	$122	None	15
2	Penske Buick Gmc Of Cerritos	Cerritos	A	100	$122	None	4
3	Reynolds Gmc	West Covina	A	100	$122	None	4
4	Costa Mesa Gmc	Costa Mesa	A	98	$85	20%	10
5	Hardin Buick Gmc	Anaheim	A	90	$131	15%	13
6	Thorson Motor Center	Pasadena	B	89	$85	38%	8
7	Laguna Niguel Gmc	Laguna Niguel	B	88	$85	75%	4
8	Tustin Buick Gmc	Tustin	C	73	$85	100%	5

For the live list, including dealers graded since this page last updated, see the live GMC dealer rankings near Riverside-San Bernardino on the CarEdge Dealer Transparency Index.

Compare GMC Dealers in Other Metros

CarEdge has graded GMC dealers in 36 US metros using verified out-the-door quotes. Compare other markets:

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How to Use This Data When You Shop

1. Get an OTD quote in writing before you visit. Any dealer can send a worksheet by email — if they won’t, that’s a red flag.
2. Ask for a quote with zero add-ons. Everything in the F&I office is optional. Say “please remove all dealer add-ons” and see what the price does.
3. Anchor to the OTD, not the advertised price. Dealers with a gap between advertised price and final OTD aren’t being straight with you. Don’t negotiate off the advertised number.
4. Compare three dealers minimum. Even within the same metro, dealer fees, quoted add-ons and advertised price accuracy vary widely. Use this ranking as your shortlist.

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Rankings are generated from the CarEdge Dealer Transparency Index, a public methodology that scores dealers on verified out-the-door quotes — not Google star ratings or paid placements. CarEdge refreshes the rankings daily as new verified quotes come in.