Compare nearby: Best Buick Dealerships in St. Louis →
O'fallon Buick GMC earns a B.
Early deals look mostly fair. Read the out-the-door carefully before you sign.
- $599
- Doc fee
- 100%
- Dealer add-ons
$69 above MO avg
On 3 of 3 recent quotes
Developing confidenceO'Fallon, MOUpdated How we score dealers
The full story
Why O'fallon Buick GMC earned this grade
Between December 2025 and August 2026, CarEdge negotiated or logged 3 verified deals with this dealership. We pulled the doc fee, the add-ons, and the gap between advertised and out-the-door price from each one. Then we graded them the way a friend in the business would: on the things that actually cost you money.
✓ What they do well
1 thingAdvertised pricing is largely honest
On average, the quoted price is only 1.4% above the listing — small enough to be fees, not markup games.
! Where to push back
2 thingsDoc fee is slightly padded
$599 is $69 above the MO average of $530. Not outrageous, but worth questioning.
TipFactor it into your overall price — every dollar here is negotiable.
Quoted add-ons show up on most deals
100% of quotes include add-ons that aren't marked optional. Across all recent quotes, add-ons average $299. Plan on seeing them on your quote.
TipAsk for an itemized quote before signing, and ask the dealer to confirm in writing which add-ons, if any, are required.
3 verified OTD quotes from O'fallon Buick GMC
Real out-the-door worksheets, not reviews. Click “View Quote” on any row to see the price breakdown.
Recent Quotes
Verified out-the-door prices from real transactions
3 verified quotes
Most Common Add-ons
At a Glance
Tips for O'fallon Buick GMC
- 3 of 3 quotes included $897 in add-ons (Paint Protection), not marked optional.
- Dealer markup is only +1% above listing (excluding taxes). This dealer keeps their fees minimal.
- Limited data (3 quotes). Score may change as we collect more information.
Keep researching
Look up another dealer by name, brand, city, or zip.
On the lot right now
Separate from the grade above: this is what's currently listed. Useful for spotting aging stock with room to negotiate.
Current Inventory
View all 434 vehicles →$48,559
Median Price
36
Median Days Listed
95
Added This Week
Days on Market
How long vehicles have been listed. Older stock means more room to negotiate.
Nearby Rated Dealers
These dealers near O'Fallon have transparency scores based on verified pricing data.
Frequently Asked Questions
What fees does O'fallon Buick GMC charge?
Based on 3 verified out-the-door quotes collected by CarEdge, O'fallon Buick GMC charges a $599 documentation fee and averages $299 in dealer add-ons when present. O'fallon Buick GMC earns Transparency Grade B (80/100).
What is the doc fee at O'fallon Buick GMC?
O'fallon Buick GMC charges a typical documentation fee of $599. The MO average is $530. This is based on 3 verified OTD quotes in our database.
Does O'fallon Buick GMC add dealer add-ons?
O'fallon Buick GMC adds an average of $299 in dealer add-ons when present. Dealer add-ons appeared on 3 of 3 recent verified quotes. Ask for an itemized breakdown and negotiate to remove non-essential items like paint protection, nitrogen tire fill, or VIN etching.
Is O'fallon Buick GMC a good dealership?
O'fallon Buick GMC has a transparency score of 80/100, earning a Grade B. This score is based on their doc fees, add-on behavior, dealer markup, and data quality from 3 verified OTD quotes. This is a well-above-average score, indicating transparent pricing practices.
What do reviews say about O'fallon Buick GMC?
CarEdge reviews O'fallon Buick GMC on 3 verified out-the-door quotes, not star ratings. It earns transparency grade B (80/100), with a typical doc fee of $599 versus an MO average of $530. Dealer add-ons appeared on 3 of 3 recent quotes.
Is O'fallon Buick GMC a transparent Buick dealer in O'Fallon?
Yes. O'fallon Buick GMC holds CarEdge Transparency Grade B (80/100), based on 3 verified out-the-door quotes. That is well above average on doc fees, add-ons and pricing accuracy.
How does O'fallon Buick GMC compare to other Buick dealers?
You can compare O'fallon Buick GMC's transparency score, doc fees, and add-on behavior against other Buick dealers using our comparison tool or by browsing Buick dealers in your area. Scores are based on the same methodology for every dealer. CarEdge's market guides Best Buick Dealerships in St. Louis and Best Buick Dealerships in the US rank Buick dealers on the same data.
Explore Buick and Missouri dealer data
How we know this
Every number on this page came from a real deal.
Most dealer review sites scrape star ratings and count angry posts. We do the opposite. CarEdge shops for cars alongside thousands of real buyers every week — and when we negotiate on their behalf, we capture the full out-the-door breakdown the dealer sends back.
For O'fallon Buick GMC in O'Fallon, MO, that has meant 3 verified OTD quotes logged into our database. Each one is a PDF, an email, or a screenshot showing the actual doc fee, the actual add-ons, and the actual final price — not a salesperson's promise.
Fee Transparency
30%Is the doc fee reasonable, or is it just profit? We compare it against the state average — and the legal cap, where one exists.
Add-on Behavior
30%How often does the dealer stick you with mandatory add-ons like paint protection or theft deterrent — the kind you can't say no to? Add-ons the dealer discloses as optional don't count against them.
Price Accuracy
30%Does the advertised listing price match what you'd actually sign for? We flag dealers whose out-the-door diverges from the listing.
Data Quality
10%More data = more trustworthy grade. Dealers with lots of recent, complete quotes score higher for consistency.
The four numbers behind the grade
Weighted ScoreThe raw component scores — the math that led to B.
Doc Fee Comparison
Pulled 3 quote records · Grades update as new data comes in · Dealers cannot pay to change their score.
Let CarEdge handle this dealer
Our AI Buying Agent contacts the dealer for you, pushes for a real out-the-door price, and brings offers back for you to approve. Prefer a person? A Concierge runs the whole deal end to end.
Let CarEdge negotiate*Information provided for general informational purposes only. Scores are independently calculated and do not imply endorsement of or affiliation with any dealer. Verify all information independently before making a purchase decision. See our Terms of Service.