Kia K5 (Optima) maintenance by mileage
How often owners do it
Engine oil and filterevery 5,500 mi
Engine air filterevery 5,500 mi
Cabin air filterevery 7,500 mi
A/C refrigerant rechargeevery 10,000 mi
Wiper bladesevery 12,000 mi
Tire rotationevery 12,000 mi
When the bigger jobs come up
Batteryaround 81,000 mi
Ignition coilsaround 88,000 mi
Control arms, links and bushingsaround 109,000 mi
Tiresaround 76,000 mi
Brake rotors (replace or resurface)around 96,000 mi
Throttle body cleaningaround 88,000 mi
All 39 jobs, by mileage
| Job | Usually at | Most between | Again every | Visits |
|---|---|---|---|---|
| EGR valve | 66,000 mi | 50,000–97,000 mi | – | 244 |
| Tire rotation | 66,000 mi | 31,000–103,000 mi | 12,000 mi | 7,346 |
| Cabin air filter | 74,000 mi | 44,000–108,000 mi | 7,500 mi | 65,506 |
| Glow plugs (diesel) | 76,000 mi | 61,000–101,000 mi | – | 85 |
| Tires | 76,000 mi | 46,000–113,000 mi | – | 9,999 |
| Wiper blades | 76,000 mi | 46,000–110,000 mi | 12,000 mi | 9,053 |
| DPF cleaning (diesel) | 76,000 mi | 53,000–100,000 mi | – | 706 |
| Brake fluid | 77,000 mi | 51,000–109,000 mi | 21,000 mi | 22,289 |
| Engine oil and filter | 79,000 mi | 47,000–116,000 mi | 5,500 mi | 301,412 |
| Engine air filter | 80,000 mi | 47,000–115,000 mi | 5,500 mi | 77,855 |
| Transmission fluid | 80,000 mi | 60,000–116,000 mi | 32,000 mi | 24,513 |
| Battery | 81,000 mi | 54,000–114,000 mi | – | 18,374 |
| Wheel alignment | 82,000 mi | 50,000–119,000 mi | 20,000 mi | 12,095 |
| Clutch | 82,000 mi | 64,000–106,000 mi | – | 153 |
| Differential / gear oil | 85,000 mi | 68,000–117,000 mi | – | 37 |
| Spark plugs | 86,000 mi | 62,000–121,000 mi | 33,000 mi | 16,481 |
| Fuel injectors | 87,000 mi | 64,000–119,000 mi | – | 542 |
| Ignition coils | 88,000 mi | 64,000–121,000 mi | – | 11,896 |
| Throttle body cleaning | 88,000 mi | 62,000–117,000 mi | – | 4,583 |
| Front brake pads | 92,000 mi | 62,000–128,000 mi | 25,000 mi | 35,186 |
| Drive (serpentine) belt | 93,000 mi | 70,000–128,000 mi | – | 1,507 |
| Rear brake pads or shoes | 94,000 mi | 70,000–126,000 mi | 37,000 mi | 19,109 |
| Water pump | 94,000 mi | 72,000–126,000 mi | – | 3,322 |
| Coolant (antifreeze) | 95,000 mi | 69,000–128,000 mi | 16,000 mi | 20,321 |
| Timing belt or chain | 95,000 mi | 69,000–127,000 mi | – | 876 |
| Brake rotors (replace or resurface) | 96,000 mi | 69,000–129,000 mi | – | 6,562 |
| Fuel filter | 97,000 mi | 66,000–137,000 mi | 38,000 mi | 5,004 |
| A/C refrigerant recharge | 104,000 mi | 76,000–140,000 mi | 10,000 mi | 9,563 |
| Thermostat | 106,000 mi | 79,000–145,000 mi | – | 1,272 |
| Shocks / struts | 108,000 mi | 79,000–144,000 mi | – | 4,443 |
| Wheel bearing | 108,000 mi | 75,000–147,000 mi | – | 2,381 |
| Power steering fluid | 109,000 mi | 82,000–140,000 mi | – | 1,011 |
| Control arms, links and bushings | 109,000 mi | 84,000–144,000 mi | – | 10,307 |
| Engine and transmission mounts | 109,000 mi | 81,000–151,000 mi | – | 3,347 |
| CV axle or boot | 114,000 mi | 83,000–156,000 mi | – | 4,534 |
| Brake calipers | 114,000 mi | 85,000–150,000 mi | – | 2,284 |
| Starter motor | 116,000 mi | 85,000–155,000 mi | – | 690 |
| Alternator | 121,000 mi | 90,000–158,000 mi | – | 4,025 |
| Radiator | 124,000 mi | 95,000–166,000 mi | – | 2,703 |
From 417,794 visits to independent repair shops in South Korea, 2020–2026 (model years mostly 2011–2021). Mileage converted from km and rounded; Korean-market cars can differ from US ones. Your owner’s manual comes first.