Compare like-for-like South Korean imported-car repair quotes using parts, labor, diagnostics, written warranty, expected rework, travel, owner time, downtime, present-value lifetime cost, break-even thresholds, and sensitivity. Other than confirmed Korean statutory aftercare references, every default amount and probability is synthetic.
Do not compare labor alone. Enter like-for-like work, parts, diagnostics, warranty, time, and downtime evidence.
Every default price, probability, and warranty day is a synthetic example for explaining the model, not a market average, quality rating, or recommended repair route.
Present-value lifetime-cost result
This is only a provisional numeric lead. Do not use it as a selection recommendation until every readiness item below is complete. (Specialist)
Present-value difference
KRW 456,095
| Cost category | Official nominal | Official PV | Specialist nominal | Specialist PV |
|---|---|---|---|---|
| Parts, labor, diagnostics, consumables | KRW 2,950,000 | KRW 2,950,000 | KRW 2,250,000 | KRW 2,250,000 |
| Travel and alternative transport | KRW 60,000 | KRW 60,000 | KRW 40,000 | KRW 40,000 |
| Owner time | KRW 120,000 | KRW 120,000 | KRW 80,000 | KRW 80,000 |
| Downtime | KRW 160,000 | KRW 160,000 | KRW 240,000 | KRW 240,000 |
| Expected gross rework | KRW 121,194 | KRW 119,416 | KRW 227,239 | KRW 223,905 |
| Expected warranty credit | KRW -121,194 | KRW -119,416 | KRW -0 | KRW -0 |
Month 0 includes quote, access, owner time, and downtime; later rows show expected rework out-of-pocket.
| Month | Official nominal | Official PV | Specialist nominal | Specialist PV |
|---|---|---|---|---|
| 0 months | KRW 3,290,000 | KRW 3,290,000 | KRW 2,610,000 | KRW 2,610,000 |
| 6 months | KRW 0 | KRW 0 | KRW 227,239 | KRW 223,905 |
All other inputs stay fixed while specialist rework probability changes to 50%, 100%, and 150% of the base assumption.
| Scenario | Rework probability | Official PV | Specialist PV | Numeric PV low |
|---|---|---|---|---|
| Low 50% | 7.5% | KRW 3,290,000 | KRW 2,721,953 | Specialist |
| Base 100% | 15% | KRW 3,290,000 | KRW 2,833,905 | Specialist |
| High 150% | 22.5% | KRW 3,290,000 | KRW 2,945,858 | Specialist |
A large repair after the factory warranty ends can produce a striking gap between an official imported-car service-center quote and an independent specialist quote.
The labor line rarely explains the whole gap.
One quote may include manufacturer diagnostics, online coding, genuine parts, calibration, a loaner, and a written rework promise while the other may price some of those items only after disassembly.
A lower headline can become the higher economic cost once repeat travel, time away from work, vehicle downtime, or uncovered rework appears.
This calculator aligns parts, labor, diagnostics, consumables, access cost, owner time, downtime, expected rework, and written warranty coverage over one analysis horizon.
It escalates a future rework event, discounts the expected out-of-pocket amount to present value, and then reports nominal lifetime cost, present-value lifetime cost, equivalent monthly cost, and several break-even thresholds.
It does not rank shops, estimate mechanical safety, or convert a brand name into an invented cash value.
Its purpose is to expose missing quote scope and make the next written question obvious.
Choosing the lower labor line while omitting diagnostics, coding, parts grade, repeat work, transport, or downtime
The lower present-value lifetime cost for the same repair and part specification over a three-to-five-year horizon
Send both providers the same itemized scope and obtain written prices, warranty days, coverage, and exclusions
The default screen demonstrates calculations but deliberately makes no recommendation.
First, describe the repair and part specification.
Then confirm that both quotes use the same work scope, part number and grade, new or remanufactured condition, VAT basis, and diagnostic or coding scope.
Finally, confirm both written quote totals and both written warranty terms.
If any gate remains incomplete, the tool may show which numeric TCO is provisionally lower, but it labels that result as not ready for selection.
A genuine new part, an OEM-supplier part, a remanufactured unit, and an unrelated aftermarket unit can differ in warranty, lead time, return rights, and required programming.
The calculator does not assign an arbitrary KRW premium to one label.
Define the minimum acceptable specification first and request that same specification from both providers.
If neither provider can quote it, preserve the alternatives as different products and make a separate qualitative decision.
Owner time and downtime are economic costs rather than automatic cash payments.
Set them to zero when they genuinely do not affect the decision, and save a second scenario when a commercial or commuting vehicle makes availability valuable.
Avoid double counting: do not enter a free loaner as both zero transport and a positive rental expense, and do not repeat coding under labor when it already appears in diagnostics.
Evidence alignment normally matters more than a sophisticated discount-rate assumption.
Quote total = parts + labor + diagnostics and coding + consumables and other
Initial economic cost = quote total + travel and transport + owner hours × hourly value + downtime days × daily value
Expected gross rework = event cost × probability × (1 + annual escalation)event month / 12
Expected warranty benefit = expected gross rework × applicable coverage rate
Rework out-of-pocket PV = (expected gross rework − warranty benefit) ÷ (1 + annual discount rate)event month / 12
Lifetime-cost PV = initial economic cost + rework out-of-pocket PV
The model converts the expected rework month to days using 365.2425 days per year divided across twelve months.
Warranty coverage applies only when that event day is no later than the entered warranty days.
If the event is later, warranty benefit is zero even when the entered coverage rate is 100%.
If the event month is beyond the analysis horizon, the cost is excluded and a warning identifies the horizon mismatch.
A short horizon should never be used merely to erase a known later obligation.
The specialist probability that makes both PV totals equal while other inputs remain fixed
The specialist labor amount that makes both PV totals equal while all non-labor assumptions remain fixed
The warranty PV needed to reduce the official gross-without-credit cost to the specialist PV
Every default price, probability, and warranty day is synthetic and does not represent a South Korean market average or either channel's quality.
The example uses a 60-month-old vehicle at 80,000 km, a 60-month horizon, a 3% annual discount rate, and 2% annual rework-cost escalation.
The official quote contains KRW 1,800,000 parts, KRW 900,000 labor, KRW 150,000 diagnostics and coding, and KRW 100,000 other cost.
Travel, owner time, and downtime lift its initial economic cost from a KRW 2,950,000 quote to KRW 3,290,000.
The specialist quote contains KRW 1,500,000 parts, KRW 550,000 labor, KRW 100,000 diagnostics, and KRW 100,000 other cost.
Its initial economic cost becomes KRW 2,610,000 after access, time, and downtime.
Both channels use a KRW 1,500,000 rework event at month 6, but the example probabilities are 8% official and 15% specialist.
The official 365-day, 100% warranty covers the modeled event while the specialist 90-day warranty does not reach month 6.
| Result | Official center | Specialist | Interpretation |
|---|---|---|---|
| Written quote total | KRW 2,950,000 | KRW 2,250,000 | Parts, labor, diagnostics, and other |
| Initial economic cost | KRW 3,290,000 | KRW 2,610,000 | Quote plus access, owner time, and downtime |
| Expected gross rework | KRW 121,194 | KRW 227,239 | Probability-weighted and escalated nominal event |
| Warranty benefit PV | KRW 119,416 | KRW 0 | Only the modeled official event is within warranty |
| Rework out-of-pocket PV | KRW 0 | KRW 223,905 | Expected amount after warranty and discount |
| Present-value lifetime cost | KRW 3,290,000 | KRW 2,833,905 | Provisional specialist lead of KRW 456,095 |
| Equivalent monthly cost | KRW 59,058 | KRW 50,871 | PV converted over 60 months |
All four like-for-like checks and both quote and warranty confirmations start unchecked.
The specialist is only the provisional numeric low until actual evidence replaces the synthetic inputs.
With all else fixed, the specialist rework-probability break-even is 45.56% and the specialist labor-cost break-even is KRW 1,006,095.
The official route needs KRW 575,511 of warranty value to meet specialist PV, but its current synthetic expected warranty benefit is only KRW 119,416.
The calculator does not fill that remaining gap with vague brand confidence.
The sensitivity table holds every input fixed except specialist rework probability.
It recalculates at 50%, 100%, and 150% of the entered base rate, capped at 100%.
In the synthetic example those scenarios are 7.5%, 15%, and 22.5%, and the specialist remains the provisional numeric low at all three levels.
That does not prove specialist quality; it only says the entered price gap is larger than those particular expected rework changes.
The direct probability threshold supplies a stronger boundary than the three preset rows.
If evidence suggests a plausible specialist probability above 45.56% in the example, the official route becomes numerically lower.
If the threshold is unavailable, the modeled specialist rework event has no out-of-pocket unit cost within the horizon, so changing its probability cannot produce a crossing.
Save at least one zero-time-cost scenario and one conservative downtime scenario when availability assumptions drive the winner.
| Scenario | Specialist probability | Specialist rework PV | Specialist TCO PV | Numeric low |
|---|---|---|---|---|
| Low 50% | 7.5% | KRW 111,953 | KRW 2,721,953 | Specialist |
| Base 100% | 15% | KRW 223,905 | KRW 2,833,905 | Specialist |
| High 150% | 22.5% | KRW 335,858 | KRW 2,945,858 | Specialist |
The National Law Information Open API was checked on September 1, 2026.
Automobile Management Act Article 58(5) was verified through its article history at MST 260605, effective February 21, 2025, while the current act search record was law ID 001747 and MST 286989.
Automobile Management Act Enforcement Rule Article 134 was checked at law ID 007928 and MST 286695, effective June 3, 2026.
The law service also showed a later Article 58 effective-state marker for December 17, 2026, so this legal boundary must be rechecked after that date.
Article 58(5) addresses repair-business duties including offering a choice among categories such as new, used, or remanufactured parts, disclosing standard repair time, posting hourly labor and standard time, issuing estimates and repair statements, and providing aftercare information.
Rule Article 134 requires repair estimates and statements to be retained for one year and sets free inspection or repair periods when a failure was caused by improper repair work.
Those statutory periods are not a blanket product warranty and do not automatically prove that one later failure was caused by the original work.
| Vehicle-age or mileage condition | Reference period | Calculator order |
|---|---|---|
| Under one year old or no more than 20,000 km | 90 days | Applied first when either condition is met |
| Under three years old or no more than 60,000 km | 60 days | Applied after the 90-day condition |
| At least three years old and over 60,000 km | 30 days | Applied when neither earlier condition is met |
The calculator uses entered warranty days and coverage only to model expected private cost.
A shorter written warranty does not by itself decide the legality of statutory aftercare, and a 90-day reference does not guarantee every failure for 90 days.
Causation, repair records, part information, mileage, notice timing, evidence, and the current rule matter.
Preserve the estimate, repair statement, payment record, messages, warning lights, scan report, photographs, and a dated notice when a dispute is possible.
Do not assume all protection disappeared with the vehicle warranty; obtain a new written repair warranty from each provider for the specific work.
Confirm whether the scan report can be used, whether a second diagnosis is required, and whether the official diagnostic fee belongs to both scenarios or only one.
Model the waiting days, actual loaner coverage, rental-vehicle out-of-pocket, repeated visits, and work impact rather than treating delivery time as free.
Request repair statements and part numbers instead of relying on a seller description, then seek two quotes for the same forecast work.
Confirm manufacturer tooling, online coding access, calibration, adaptation, road test, and post-repair scan in both scopes.
Treat evidence quality, responsible warranty party, location, repeat-visit burden, data access, and vehicle availability as separate decision criteria.
Save or print the final inputs beside the two original quotes so a later reader can reproduce the result.
If the repair changes after disassembly, duplicate the scenario and update both scopes rather than silently editing only the selected provider.
A calculation without its evidence date can become stale when parts availability, warranty policy, or law changes.
No. This tool does not assess safety or workmanship. Verify procedure, diagnostic equipment, technician capability, parts source, warranty, and the actual vehicle condition separately.
Do not treat the default as a statistic. Build low, base, and high user scenarios from your repair history, the failure type, written rework policy, and evidence quality.
The contractual warranty and statutory aftercare for a failure caused by defective repair are different concepts. Check causation, applicability, current law, and professional advice.
It can be zero for the fully covered period when fuel, insurance, mileage, and deductible create no burden, but owner visit and waiting time remain separate.
The model uses one representative expected event. Combine defensible independent expected costs into one conservative event or save separate scenarios.
The calculator supplies no universal rate. Use your funding opportunity cost and repair-cost assumption, then compare zero, base, and higher-rate cases.
Convert both alternatives to the final amount you expect to pay. Add expected VAT where needed before confirming the same VAT basis.
The four direct-cost fields can reproduce a total, but an itemized entry makes omitted scope, revised questions, and the labor break-even much easier to audit.
No. Registration is an important legal and evidence check, not a quality score. Review qualifications, equipment, scope, records, and aftercare for the actual work.
Initial cash, parts lead time, warranty responsibility, repeat-visit distance, loaner certainty, record quality, and vehicle availability may matter more than a small modeled difference.
Method and legal boundary last checked September 1, 2026.
Recheck Article 58 after December 17, 2026, and recheck whenever the statute, enforcement rule, NIST handbook, or actual quote terms change.
Put both itemized quotes beside the calculator and replace every synthetic default with documented parts, labor, diagnostics, warranty, transport, time, and downtime evidence.
Save the readiness, break-even, and sensitivity results, then send every missing scope or warranty question to both providers before selecting a repair route.