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Evaluate used car listings, estimate fair prices, and guide purchasing decisions.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
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| name | used-car-advisor |
| description | Evaluate used car listings, estimate fair prices, and guide purchasing decisions. |
Evaluate used car listings, estimate fair value, flag known-problem models, and coach negotiation.
When a user asks to find a car, follow these steps in order:
Step 1: Search for real listings across multiple platforms. Use specific price, mileage, and location filters. Present actual listings with real prices — never lead with ballpark estimates.
Step 2: Collect and organize results. For each listing, capture: year/make/model/trim, price, mileage, location, dealer vs. private, and listing URL.
Step 3: Evaluate and compare. Apply the Fair Price Method (below) and flag any Known Problem Models or Red Flags.
Step 4: Provide pre-filtered search links so the user can browse themselves (e.g., cars.com/shopping/ferrari-california/price-under-80000/). Don't just link site homepages.
| Source | Best for | Notes |
|---|---|---|
cargurus.com | Deal ratings, days-on-market | Shows "great/good/fair/overpriced" vs. market |
cars.com | Pre-filtered URLs by price/make | Supports URL filters like /price-under-80000/ |
autotrader.com | Broad dealer inventory | Good trim-level filtering |
edmunds.com | Listings + TMV pricing | Combines inventory with valuation |
autolist.com | Savings vs. market average | Aggregates from multiple sources |
| Facebook Marketplace | Private sellers | Often cheaper than dealers; search by region |
carsforsale.com | Broader dealer network | Good for less common models |
Bring a Trailer (bringatrailer.com) | Specialty/enthusiast/exotic cars | Auction format with sold-price history |
Hemmings (hemmings.com) | Classic and collector cars | Specialty listings |
DuPont Registry (dupontregistry.com) | Luxury and exotic cars | High-end inventory |
preowned.ferrari.com | CPO Ferraris | Factory-certified pre-owned |
| Need | Source | Query pattern |
|---|---|---|
| Recalls by VIN | nhtsa.gov/recalls | Fetch directly with 17-char VIN |
| Complaint clusters | carcomplaints.com | "[year] [model] problems site:carcomplaints.com" |
| Repair cost estimates | repairpal.com | "[model] [repair] cost repairpal" |
| Fair market value | KBB, Edmunds, cargurus.com (shows days-on-market + deal rating) | |
| TSBs (technical service bulletins) | nhtsa.gov or "[model] TSB [symptom]" | |
| Long-term reliability | dashboard-light.com, Consumer Reports (paywalled — search "consumer reports [model] reliability reddit" for summaries) |
When user mentions any of these, warn before discussing price:
| Avoid | Years | Issue | Failure cost |
|---|---|---|---|
| Ford Focus/Fiesta | 2011-2016 | PowerShift DCT — shudder, slip, class-action settled | $3-4k transmission |
| Nissan Altima/Sentra/Rogue/Pathfinder/Versa | 2013-2017 (worst) | Jatco CVT — overheats, limp mode, ~120k mi lifespan | $3.5-5k |
| Subaru (most) | 2012-2017 | CVT (warranty extended); also head gasket <2012 | $2-7k |
| BMW/Audi/Mercedes | Any out of warranty | Normal wear = premium parts/labor; depreciates 50%+ by yr 5 | Budget $2-3k/yr |
| Hyundai/Kia 2.0/2.4L Theta II | 2011-2019 | Rod bearing failure, engine seizure (recall) | Engine replacement |
| Chevy Cruze | 2011-2015 | Coolant leaks, turbo failure | $1-2k recurring |
CVT buying rule: Demand transmission fluid service records. No CVT service by 60k mi (4-cyl) or 80k mi (6-cyl) → walk away. Metal belt on metal pulleys — old fluid = cooked transmission.
Safe defaults: Toyota Corolla/Camry, Honda Civic/Accord (Honda's CVT is the exception — reliable), Mazda3/6, Lexus anything. Toyota Prius 2009-2020: 5/5 CR reliability every year.
Exotic and high-performance cars (Ferrari, Lamborghini, Porsche, McLaren, Aston Martin, Maserati, etc.) operate on completely different cost structures. Flag this immediately when a user asks about these brands.
| Item | Mainstream | Exotic/Luxury |
|---|---|---|
| Pre-purchase inspection | $100-200 | $300-500+ (specialist required) |
| Annual maintenance budget | $500-1,500 | $5,000-10,000+ |
| Transmission repair | $2-5K | $15-25K+ |
| Engine work | $3-8K | $15-50K+ |
| Brake job (all 4) | $300-800 | $3,000-8,000 (carbon ceramics: $15K+) |
| Tires | $400-800/set | $1,500-4,000/set |
Exotic car buying rules:
| Flag | What it means |
|---|---|
| Salvage/rebuilt/"clean rebuilt" title | Totaled once. Insurance may refuse comprehensive. -40% value |
| Price 20%+ below CarGurus "great deal" | Scam or undisclosed damage |
| "Runs great, just needs [X]" | If it were cheap to fix, they'd have fixed it |
| Odometer ends in 000 / round number | Possible rollback; cross-check Carfax mileage entries |
| No cold-start video on request | Hiding startup rattle (timing chain) or blue smoke (rings) |
| Dealer add-ons mandatory (nitrogen tires, VIN etching, "protection package") | Junk fees — refuse or walk |
Before contact:
The ask:
Timing: Last 2-3 days of the month, weekday morning. Salespeople under quota will eat margin. (Caveat: if they already hit quota this does nothing.)
Trade-in: Get it appraised separately (CarMax/Carvana give free written offers). Never let them bundle trade-in value into the purchase — it obscures both numbers.
Before signing: Read every line of the buyer's order. Reject "market adjustment," "dealer prep," mandatory add-ons. Verify VIN on contract = VIN on door jamb.
$100-200 at an independent shop ($300-500 for exotics — use a marque specialist). NOT the seller's mechanic. Any seller who refuses → walk. Specifically request:
Regional pricing differences can be significant — always search multiple regions:
| Region | Tends to be cheaper for | Watch out for |
|---|---|---|
| Midwest / South | Luxury & exotic cars (lower demand) | Hail damage (Midwest), flood titles (Gulf states) |
| Southwest (AZ, NV, NM) | Older cars (no rust) | Sun damage to paint/interior |
| Northeast / Rust Belt | Nothing specific | Frame rust, salt corrosion — get underbody inspection |
| Florida | High supply of luxury/exotic | Flood damage, hurricane salvage titles |
| California | High supply overall | Higher prices due to demand; emissions compliance |
Tip: Search nationwide first to establish fair market price, then narrow by region. A $5K price difference can justify shipping ($500-1,500 depending on distance).
After finding the best options, build a web app that displays a visual comparison page so the user can evaluate listings side-by-side.
Always generate the comparison page alongside the text-based analysis — the web app is a visual complement, not a replacement for the detailed evaluation.
