Last updated: 2026-10-10
Kia Optima vs Subaru Legacy: Reliability Compared
Kia Optima
Subaru Legacy
Reliability favors the Subaru Legacy over the KIA Optima by a slight margin, because Optima engines lose oil and sometimes catch fire. The Legacy's main complaints are cracked windshields and cabin leaks. The Optima does cost less to repair each year, so the gap between them is narrow.
How Do the Kia Optima and Subaru Legacy Generations Compare?
Verdict
The Subaru Legacy is more reliable than the Kia Optima, scoring 75/100 vs 71/100.
Reliability leans toward the Legacy, but only by a slight edge. Owner complaints per vehicle sold run a little lower, and its problems are mostly windshield cracks and cabin water leaks. The Optima's trouble is heavier: engines lose oil with no visible leak, some fail outright, and fires are reported. Its air bag and brake complaints also include many crashes. The Optima does cost less to repair each year, and the chance of a major repair is the same for both, so the gap stays narrow.
Key Differences
- 1Kia Optima costs $92 less per year to repair
- 2Kia Optima has 16 fewer total recalls
- 3Subaru Legacy scores 4 points higher in reliability
Category Scoreboard
Kia Optima vs Subaru Legacy: Which Is More Reliable?
| Metric | Kia Optima | Subaru Legacy |
|---|---|---|
| Reliability Score | 71/100 | 75/100 |
| Years Tracked | 3 | 8 |
| Total Recalls | 3 | 19 |
| Complaints per 10k Sold | 23.3 | 21.2 |
| Annual Repair Cost | $471/yr | $563/yr |
| Repair Frequency | 0.2/yr | 0.3/yr |
| Major Repair Risk | 12% | 12% |
| Safety RatingNHTSA overall | 2020 NHTSA | 2025 NHTSA |
| Frontal | ||
| Side | ||
| Rollover | ||
| Year Wins | 2 (1 tied) | 0 (1 tied) |
What Are the Common Problems With the Kia Optima and Subaru Legacy?
Glass and electronics dominate the Legacy's complaints. Windshields crack with no impact, sometimes again within weeks of replacement, and water leaks into the cabin and ruins the radio and amplifier. A few reports describe sudden surges at low speed that ended in crashes. The Optima's complaints center on the engine. Oil vanishes between changes, plugs foul, and some engines fail, with fires reported. It also has crash-linked air bag complaints, where bags did not deploy, and brake complaints where the pedal sinks to the floor. The Legacy has no comparable air bag or brake group.
| Component | Kia Optima | Subaru Legacy |
|---|---|---|
| ENGINE | 8.5Above Avg | 0.5Very Low |
| ELECTRICAL SYSTEM | 2.3Low | 4.5Average |
| VISIBILITY/WIPER | —None | 6.5Average |
| UNKNOWN OR OTHER | 2.6Low | 3.6Average |
| POWER TRAIN | 2.4Low | 0.4Very Low |
| AIR BAGS | 1.1Low | 0.4Very Low |
| SERVICE BRAKES | 1.1Low | 0.2Very Low |
| STRUCTURE | 0.8Very Low | 0.1Very Low |
| VISIBILITY | —None | 0.9Very Low |
| STEERING | 0.6Very Low | 0.3Very Low |
| ENGINE AND ENGINE COOLING | 0.8Very Low | —None |
| VEHICLE SPEED CONTROL | 0.2Very Low | 0.5Very Low |
| FORWARD COLLISION AVOIDANCE | 0.4Very Low | 0.2Very Low |
| FUEL/PROPULSION SYSTEM | 0.3Very Low | 0.3Very Low |
| EXTERIOR LIGHTING | 0.4Very Low | —None |
| SEAT BELTS | 0.1Very Low | —None |
Complaints per 10,000 units sold, aggregated across all tracked model years from NHTSA owner reports.
Which Is Cheaper to Maintain: Kia Optima or Subaru Legacy?
How Does Kia Optima vs Subaru Legacy Reliability Compare by Year?
| Year | Kia Optima | Subaru Legacy | Edge |
|---|---|---|---|
| 2020 | 72/1000R / 138C | 67/1006R / 121C | Kia Optima |
| 2019 | 72/1001R / 205C | 69/1003R / 123C | Kia Optima |
| 2018 | 70/1002R / 230C | 70/1003R / 116C | Tie |
Best years to cross-shop: The 2020 Kia Optima scored 72/100 and the 2018 Subaru Legacy scored 70/100 — the strongest shared model years that have been on the road for at least two years, where available.
Who Should Buy the Kia Optima vs the Subaru Legacy?
Kia Optima vs Subaru Legacy: Common Questions
- Is the Subaru Legacy more reliable than the KIA Optima?
- Yes, but only slightly. The Legacy has a somewhat lower complaint rate per vehicle sold, and its common problems are windshield cracks and water leaks. The Optima's most common complaint is engine oil loss, with some engine failures and fires reported. The chance of a major repair is 12% for both.
- Which has more recalls, the Legacy or the Optima?
- The Legacy has more, with 19 across eight model years in federal recall records. The Optima has 3 across three model years. The Legacy data covers more years, so the totals are not a like-for-like comparison. Check the VIN of any specific car for open recalls.
- Which is cheaper to repair, the Legacy or the Optima?
- The Optima is cheaper. Independent repair-cost data estimates $471 a year for the Optima and $563 for the Legacy, a difference of about $460 over five years. The Optima also makes fewer unscheduled shop visits, 0.2 a year against 0.3 for the Legacy.
- What is the biggest problem with the KIA Optima?
- Engine oil loss. Owners add oil every week or two with no visible leak, and the low-oil light often comes on only when the level is very low. Some cases lead to fouled plugs, misfires, a failed valve or complete engine failure, and fires have been reported.
- Why do Subaru Legacy windshields crack?
- The data does not give a cause. Owners report cracks that appear with no visible impact, sometimes overnight in a parked car or after a cold start with the defroster on. Some replacement glass cracked again within weeks, and replacement needs EyeSight camera recalibration, which adds cost.
Related Reliability Comparisons
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Decided between Kia Optima and Subaru Legacy? Run a VIN check before you buy — uncover hidden accidents, title issues, and open recalls.
How we score the Kia Optima and Subaru Legacy
Scores weight complaint severity at 35%, repair costs at 30%, recall impact at 20%, and the spread of complaints across systems at 15%, with complaint counts adjusted for US sales. Read the full methodology.
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