Best Buick Dealerships in St. Louis, Ranked by CarEdge Data

This is the CarEdge Dealer Transparency Index ranking for Buick dealers in the St. Louis metro. We graded every Buick 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.

4 Buick dealers in St. Louis currently clear the data threshold. It’s a smaller field — 4 more Buick dealers are tracked below but do not yet have enough verified quotes to grade — so treat this as a focused shortlist and still gather your own quotes. Here’s how they rank.

Last updated October 16, 2026. CarEdge refreshes these rankings daily as new verified out-the-door quotes come in.

The Best Buick Dealers in St. Louis

The best Buick dealer in St. Louis by verified out-the-door price data is Dave Sinclair Buick Gmc (St. Louis, MO): A grade, 92/100 across 10 verified quotes, with quotes that match the advertised price.

Close behind:

2. Laura Buick Gmc (Collinsville), A grade, 91/100 across 5 verified quotes, with a $377 doc fee, under the IL average of $379.
3. Cardinal Buick Gmc Inc (Belleville), B grade, 87/100 across 4 verified quotes, with a $368 doc fee, under the IL average of $379.

Full ranking, fees and add-on data for every graded dealer are below.

Top 4 Buick Dealers in St. Louis

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

#1 — Dave Sinclair Buick Gmc

Grade: A · Score: 92/100 · St. Louis, MO

Dave Sinclair Buick Gmc is the top-graded Buick dealer in the St. Louis metro by verified data — A grade, 92/100, based on 10 verified OTD quotes.

• Doc fee: $599 — above the MO average of $514
• Add-ons: 30% of quotes, avg $269
• Listing accuracy: Quoted price matches the advertised listing
• Verified quotes: 10

See full review & verified quotes →

#2 — Laura Buick Gmc

Grade: A · Score: 91/100 · Collinsville, IL

Laura Buick Gmc quotes prices within 0.6% of the advertised listing — one of the cleanest pricing patterns on this list.

• Doc fee: $377 — below the IL average of $379
• Add-ons: 40% of quotes, avg $358
• Listing accuracy: 0.6% above the advertised listing
• Verified quotes: 5

See full review & verified quotes →

#3 — Cardinal Buick Gmc Inc

Grade: B · Score: 87/100 · Belleville, IL

Cardinal Buick Gmc Inc earns a solid B on verified data — a doc fee at or below the IL average. The one watch-out: add-ons show on 75% of quotes (avg $236).

• Doc fee: $368 — below the IL average of $379
• Add-ons: 75% of quotes, avg $236
• Listing accuracy: 1.4% below the advertised listing
• Verified quotes: 4

See full review & verified quotes →

#4 — O’Fallon Buick Gmc

Grade: C · Score: 79/100 · O’Fallon, MO

O’Fallon Buick Gmc grades a C — add-ons appear on 100% of verified quotes, averaging $324. Ask for an itemized OTD before signing.

• Doc fee: $599 — above the MO average of $514
• Add-ons: 100% of quotes, avg $324
• Listing accuracy: 1.2% above the advertised listing
• Verified quotes: 4

See full review & verified quotes →

Limited Data

These Buick dealers in the St. Louis metro have verified OTD data, but not yet enough to assign a confident grade. We’re actively collecting more quotes for these dealers.

• Bob Brockland Buick Gmc (Columbia, IL) — based on 1 verified OTD quote. View dealer page
• Quality Buick Gmc Cadillac (Alton, IL) — based on 1 verified OTD quote. View dealer page
• Sapaugh Buick Gmc (Herculaneum, MO) — based on 1 verified OTD quote. View dealer page
• Lou Fusz Buick Gmc (St. Louis, MO) — based on 3 verified OTD quotes. 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.

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

• Fee Transparency (30%) — Is the doc fee reasonable compared to the state average?
• Add-on Behavior (30%) — How often does the dealer bundle add-ons, and at what cost?
• Price Accuracy (30%) — Does the listing price match the actual OTD price?
• Data Quality (10%) — More verified quotes mean higher confidence in the grade.

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

St. Louis Buick Dealer Rankings at a Glance

#	Dealer	City	Grade	Score	Doc Fee	Add-Ons	Quotes
1	Dave Sinclair Buick Gmc	St. Louis	A	92	$599	$269	10
2	Laura Buick Gmc	Collinsville	A	91	$377	$358	5
3	Cardinal Buick Gmc Inc	Belleville	B	87	$368	$236	4
4	O’Fallon Buick Gmc	O’Fallon	C	79	$599	$324	4

Compare Buick Dealers in Other Metros

CarEdge has graded Buick dealers in 24 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 listing. Dealers with a gap between advertised price and final OTD aren’t being straight with you. Don’t negotiate off the listing number.
4. Compare three dealers minimum. Even within the same metro, doc fees, add-on policies, and listing 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.