The verdict in three sentences
A three-rooftop dealer group selling 1,400 used vehicles a year rarely needs to replace its OEM DMS, it needs to extend it with custom modules costing USD 50,000 to 120,000 in Miami, or EUR 30,000 to 70,000 for a comparable group in Nice. The main financial lever is time to frontline, which can drop from 21 to 12 days, avoiding USD 160 to 270 of holding cost per vehicle. On 1,400 units, savings exceed the project cost within the first year.
What the OEM DMS does poorly
The brand-mandated DMS handles service invoicing, new vehicle orders, parts and accounting. It handles the used vehicle lifecycle badly: trade-in appraisal, real reconditioning costs, photos, multi-site syndication and net profit per unit. In most groups these steps live in spreadsheets and chat apps, which is why a car waits 5 days for a part or 3 days for photos.
| Custom module | Problem solved | 2026 cost (USD, Miami) | 2026 cost (EUR excl. VAT, Nice) | Timeline |
|---|---|---|---|---|
| Trade-in appraisal | Book value, history, estimated recon, offer in 15 min | 10,000 to 20,000 | 6,000 to 12,000 | 4 to 6 weeks |
| Reconditioning workflow | Service, body, detail, photos, live status | 12,000 to 25,000 | 7,000 to 15,000 | 5 to 7 weeks |
| Per-vehicle profitability | Cost, recon, discount, net gross, aged units | 8,000 to 17,000 | 5,000 to 10,000 | 3 to 5 weeks |
| Automatic listing syndication | Cars.com, AutoTrader, group website | 7,000 to 15,000 | 4,000 to 9,000 | 3 to 4 weeks |
| Three-store inventory dashboard | Stock age, turn, inter-store transfers | 6,000 to 20,000 | 4,000 to 12,000 | 3 to 5 weeks |
| DMS and accounting connectors | Vehicle, invoice and journal sync | 7,000 to 23,000 | 4,000 to 12,000 | 4 to 6 weeks |
A tight scope (appraisal, recon, syndication) lands near USD 50,000. A full scope with two-way connectors and a mobile app for technicians approaches USD 120,000.
Calculating the holding cost of a used vehicle
An idle used car costs money every day. Floorplan interest, depreciation and lot space add up, as a 2026 order of magnitude, to USD 18 to 30 per day for a USD 20,000 vehicle.
| Daily cost item | Assumption | Cost per day |
|---|---|---|
| Floorplan financing | 7 % on USD 20,000 | USD 4 |
| Depreciation | 1.5 to 2 % per month | USD 10 to 13 |
| Lot space in Miami | Land and security | USD 2 to 6 |
| Insurance and handling | Flat | USD 1 to 2 |
| Lost sales opportunity | Listing not live | USD 1 to 5 |
| Total | USD 18 to 30 |
Saving 9 days therefore means USD 160 to 270 per unit (EUR 150 to 250 in Nice). On 1,400 vehicles: USD 225,000 to 380,000 a year.
Custom build or an off-the-shelf used car tool
SaaS used vehicle tools cost USD 400 to 1,200 per rooftop per month, or USD 14,000 to 43,000 a year for three stores. They deploy fast but rarely integrate deeply with the OEM DMS, and their profit rules are fixed. A custom build makes sense above roughly 800 used units a year, or when the group wants its own KPIs.
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Stéphane runs a three-store group in Nice selling 1,400 used cars a year, with an average time to frontline of 21 days. After deploying modules for EUR 52,000 over 4 months, the delay drops to 13 days (8 days saved). At a cautious EUR 19 per day: 8 × 19 × 1,400 = EUR 212,800 avoided per year, against EUR 6,000 of annual maintenance. Payback in under 3 months. A Miami group of the same size spending USD 85,000 sees a similar payback, as daily holding costs are slightly higher.
FAQ
Do we need to replace the OEM DMS?
No, it is rarely possible and rarely useful. Custom modules connect through APIs or scheduled exports, with connector costs of USD 7,000 to 23,000.
How quickly do results show?
First gains appear 6 to 8 weeks after the recon workflow goes live. The 12-day target is usually reached within 4 to 6 months.
Do listings go live automatically?
Yes, as soon as the status moves to "frontline ready" with approved photos. Syndication takes under 30 minutes versus 1 to 3 days manually.
Will service managers use it?
Adoption depends on simplicity: one tablet per shop, 3 to 4 statuses and 2 hours of training are enough in about 90 % of cases.
What maintenance budget should we plan?
10 to 15 % of the initial cost per year, USD 5,000 to 18,000, including listing connector updates.
Let's scope your project. Share your used vehicle volume, stores and DMS and we will scope modules between USD 50,000 and 120,000 with a 3 to 5 month plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
