The 2005 Kia Optima has 70 automatic transmission parts with verified fitment on this page — 16 part types and 28 brands, covering both the 2.4L L4 and the 2.7L V6. Each part includes a manufacturer part number and application notes.
The automatic transmission on the 2005 Kia Optima covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. The largest groups are Filter (11 parts), Transmission Fluid (10 parts) and Transmission Fluid Additive (8 parts). The other 13 part types cover the remaining 41 parts.
The 2005 Kia Optima was sold with both the 2.4L L4 and the 2.7L V6. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
28 brands supply automatic transmission parts for the 2005 Kia Optima, led by LUBEGARD (8 parts), WJB / INMOTION PARTS (7 parts) and NATIONAL (7 parts), plus 25 more brands. Quality grades include Standard Replacement, Economy and Multi-Vehicle.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2005 Kia Optima. 12 parts have it, including PA CARGO 41710L (Filter) and WJB / INMOTION PARTS WT32009X (Output Shaft Bearing). Each part number opens a page with every vehicle that part fits.
Bushing Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PA CARGO Fits: 2.4L L4 | K41905J | 🇺🇸 US 🇨🇦 CA | 4 Speed FWD F4A42 Transmission | View on Amazon |
This table covers the Bushing kits.
One part is listed for the 2005 Kia Optima — PA CARGO K41905J.
Filter
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PA CARGO Popular Fits: 2.4L L4 | 41710L | 🇺🇸 US 🇨🇦 CA | 4 Speed FWD F4A42 Transmission | View on Amazon |
| PUROLATOR Popular Fits: 2.4L L4 | P1290 | 🇺🇸 US | Style: Spin-On Lube Filter | View on Amazon |
| AUTO EXTRA Fits: 2.4L L4 | 61651064 | 🇺🇸 US | Spin-on filter | View on Amazon |
| FAMOUS BRAND Fits: 2.4L L4 | 96067 | 🇺🇸 US 🇨🇦 CA | Automatic Transmission Filter Kit4 Speed Trans or 5 Speed Trans | View on Amazon |
| VARIOUS MFR Fits: 2.4L L4 | PT1290 | 🇺🇸 US | Spin-on | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WIX Popular Fits: 2.4L L4 | 51064 | 🇺🇸 US | Spin-On Filter | View on Amazon |
| BECK/ARNLEY Fits: 2.4L L4 | 0440328 | 🇺🇸 US | Internal Filter | View on Amazon |
| RAYBESTOS POWERTRAIN Fits: 2.4L L4 | 515881 | 🇺🇸 US | Internal FilterA5GF1 Trans | View on Amazon |
| VAICO Fits: 2.4L L4 | V520468 | 🇺🇸 US | Description: ATF-Service Kit (A5GF1, A5HF1 / 5-speed)Includes Oil Pan Gasket and Sump Filter | View on Amazon |
| VAICO Fits: 2.4L L4 | V520081 | 🇺🇸 US | Hydraulic Filter | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ECOGARD Fits: 2.4L L4 | XT1290 | 🇺🇸 US | PRIMARYSPIN-ON | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
11 Filter parts are listed for the 2005 Kia Optima, from VAICO, PA CARGO, PUROLATOR and 7 other brands. PA CARGO 41710L carries the "Popular" badge.
In the Economy grade, PA CARGO, PUROLATOR, AUTO EXTRA and 2 other brands supply 5 parts: the catalog's value-priced group. A representative part number is PA CARGO 41710L.
The Standard Replacement section lists 5 options from VAICO, WIX, BECK/ARNLEY and 1 other brand — built to original-equipment specification. WIX 51064 is listed in this group.
1 ungrouped part is not assigned to a grade, with the same engine-level match.
Fluid Pan
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HYUNDAI Fits: 2.4L L4 | 4528339000 | 🇺🇸 US | View on Amazon |
This table covers the pans that hold automatic-transmission fluid.
This group shows a single part: HYUNDAI 4528339000.
Fluid Pump Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER Fits: 2.4L L4 | SR3502 | 🇺🇸 US | Front15.88 mm Width | View on Amazon |
| SKF Fits: 2.4L L4 | 99182 | 🇺🇸 US | Shaft Diameter: 1.693 In | View on Amazon |
This table covers the precision wear sleeves used to restore a transmission pump seal surface.
2 Fluid Pump Repair Sleeve parts for the 2005 Kia Optima come from 2 brands — SCHAEFFLER and SKF.
Part numbers include SCHAEFFLER SR3502 and SKF 99182.
Fluid Pump Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Fits: 2.4L L4 | 16984 | 🇺🇸 US | Front | View on Amazon |
This table covers the seals at the Fluid Pump. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
This group shows a single part: SKF 16984.
Fluid Temperature Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 2.4L L4 | 5S7692 | 🇺🇸 US | View on Amazon |
This table covers the Fluid temperature sensors. Typical signs include hard cold starts, a fan that never comes on, or a gauge that disagrees with the scan tool. A sensor that reads open or shorted is usually the part; an implausible-but-smooth reading can be wiring.
One part is listed for the 2005 Kia Optima — WELLS 5S7692.
Output Shaft Bearing
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular Fits: 2.4L L4 | WT32009X | 🇺🇸 US | Frontwith Mitsubishi F4A42 Transmission | View on Amazon |
| WJB / INMOTION PARTS Fits: 2.4L L4 | WT32006 | 🇺🇸 US | Bearing & Race Set | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL Popular Fits: 2.4L L4 | 32009X | 🇺🇸 US | Frontwith Mitsubishi F4A42 Transmission | View on Amazon |
| BCA Fits: 2.4L L4 | NB32006 | 🇺🇸 US | Taper Bearing SetIncludes Cup and Cone | View on Amazon |
| BCA Fits: 2.4L L4 | NB32009X | 🇺🇸 US | Bearing & Race Set | View on Amazon |
| NATIONAL Fits: 2.4L L4 | 32006 | 🇺🇸 US | Bearing & Race Set | View on Amazon |
This table covers the Output Shaft bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
6 Output Shaft Bearing parts for the 2005 Kia Optima come from 3 brands — WJB / INMOTION PARTS, NATIONAL and BCA. The "Popular" part is WJB / INMOTION PARTS WT32009X.
The Economy section: 2 options from WJB / INMOTION PARTS. WJB / INMOTION PARTS WT32009X is listed in this group.
Standard Replacement: 4 parts, from NATIONAL and BCA. A representative part number is NATIONAL 32009X.
Part numbers include WJB / INMOTION PARTS WT32009X, WJB / INMOTION PARTS WT32006 and NATIONAL 32009X, among others listed above.
Output Shaft Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: 2.4L L4 | NS99139 | 🇺🇸 US | Fits Right | View on Amazon |
| NATIONAL Fits: 2.4L L4 | 99139 | 🇺🇸 US | Fits Leftwith Mitsubishi F4A42 Transmission | View on Amazon |
| WJB / INMOTION PARTS Fits: 2.4L L4 | WS99139 | 🇺🇸 US | Fits Leftwith Mitsubishi F4A42 Transmission | View on Amazon |
This table covers the wear sleeves used to restore a Output Shaft seal surface.
3 Output Shaft Repair Sleeve parts are listed for the 2005 Kia Optima, from BCA, NATIONAL and WJB / INMOTION PARTS.
This group includes BCA NS99139, NATIONAL 99139 and WJB / INMOTION PARTS WS99139.
Output Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Popular Fits: 2.4L L4 | 16143 | 🇺🇸 US | View on Amazon | |
| NATIONAL Fits: 2.4L L4 | 710977 | 🇺🇸 US | Rightwith Mitsubishi_F4A42 Transmission | View on Amazon |
| NATIONAL Fits: 2.4L L4 | 710976 | 🇺🇸 US | Leftwith Mitsubishi F4A42 Transmission | View on Amazon |
| WJB / INMOTION PARTS Fits: 2.4L L4 | WS710976 | 🇺🇸 US | Leftwith Mitsubishi F4A42 Transmission | View on Amazon |
| WJB / INMOTION PARTS Fits: 2.4L L4 | WS710977 | 🇺🇸 US | Rightwith Mitsubishi_F4A42 Transmission | View on Amazon |
This table covers the seals at the Output Shaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
5 Output Shaft Seal parts are listed for the 2005 Kia Optima, from NATIONAL, WJB / INMOTION PARTS and SKF. SKF 16143 carries the "Popular" badge.
Part numbers include SKF 16143, NATIONAL 710977 and NATIONAL 710976, among others listed above.
Rebuild Kit
Banner Kit (Overhaul Kit + Friction Clutch Plates)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PA CARGO Fits: 2.4L L4 | DK4100LS | 🇺🇸 US 🇨🇦 CA | Banner Kit | View on Amazon |
Deluxe Kit (Master Kit + Filter, Band & Common Bushings)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PA CARGO Fits: 2.4L L4 | MRK4100L | 🇺🇸 US 🇨🇦 CA | Deluxe Kit | View on Amazon |
Master Kit (Overhaul Kit + Friction & Steel Clutch Plates)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PA CARGO Fits: 2.4L L4 | DK4100L | 🇺🇸 US 🇨🇦 CA | Master Kit | View on Amazon |
Overhaul Kit (Gaskets, Seals, O-Rings & Sealing Rings)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PA CARGO Popular Fits: 2.4L L4 | K41900J | 🇺🇸 US 🇨🇦 CA | Overhaul Kit | View on Amazon |
| TRANSTEC Fits: 2.4L L4 | 81000114 | 🇺🇸 US 🇨🇦 CA | without PistonsDuraprene Pan Gasket | View on Amazon |
This table covers the rebuild kits for this assembly.
5 Rebuild Kit parts for the 2005 Kia Optima come from 2 brands — PA CARGO and TRANSTEC. The "Popular" part is PA CARGO K41900J.
The Banner Kit (Overhaul Kit + Friction Clutch Plates) section lists 1 option from PA CARGO — grouped under the catalog's "Banner Kit (Overhaul Kit + Friction Clutch Plates)" designation — the notes column spells out what sets them apart. PA CARGO DK4100LS is listed in this group.
The Deluxe Kit (Master Kit + Filter, Band & Common Bushings) section lists 1 option from PA CARGO — grouped under the catalog's "Deluxe Kit (Master Kit + Filter, Band & Common Bushings)" designation — the notes column spells out what sets them apart. PA CARGO MRK4100L is listed in this group.
In the Master Kit (Overhaul Kit + Friction & Steel Clutch Plates) grade, PA CARGO supplies 1 part: grouped under the catalog's "Master Kit (Overhaul Kit + Friction & Steel Clutch Plates)" designation — the notes column spells out what sets them apart. A representative part number is PA CARGO DK4100L.
The Overhaul Kit (Gaskets, Seals, O-Rings & Sealing Rings) section lists 2 options from PA CARGO and TRANSTEC — grouped under the catalog's "Overhaul Kit (Gaskets, Seals, O-Rings & Sealing Rings)" designation — the notes column spells out what sets them apart. PA CARGO K41900J is listed in this group.
Part numbers include PA CARGO K41900J, PA CARGO DK4100LS and PA CARGO MRK4100L, among others listed above.
Shift Solenoid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HYUNDAI Fits: 2.4L L4 | 4631339051 | 🇺🇸 US | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 2.4L L4 | TCS220 | 🇺🇸 US | Solenoid shift | View on Amazon |
| WELLS Fits: 2.4L L4 | 2N1295 | 🇺🇸 US | View on Amazon |
This table covers the Shift solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid.
3 Shift Solenoid parts for the 2005 Kia Optima come from 3 brands — HYUNDAI, STANDARD MOTOR PRODUCTS and WELLS.
Listed part numbers: HYUNDAI 4631339051, STANDARD MOTOR PRODUCTS TCS220 and WELLS 2N1295.
Torque Converter Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: 2.4L L4 | NS99157 | 🇺🇸 US | View on Amazon | |
| NATIONAL Fits: 2.4L L4 | 99157 | 🇺🇸 US | with Mitsubishi F4A42 Transmission | View on Amazon |
| SCHAEFFLER Fits: 2.4L L4 | SR3483 | 🇺🇸 US | Fits Shaft Diameters of 1.572"-1.578"16 MM Width | View on Amazon |
| WJB / INMOTION PARTS Fits: 2.4L L4 | WS99157 | 🇺🇸 US | with Mitsubishi F4A42 Transmission | View on Amazon |
This table covers the wear sleeves used to restore a Torque Converter seal surface.
4 Torque Converter Repair Sleeve parts for the 2005 Kia Optima come from 4 brands — BCA, NATIONAL, SCHAEFFLER and 1 other brand.
This group includes BCA NS99157, NATIONAL 99157 and SCHAEFFLER SR3483 and the remaining parts above.
Torque Converter Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: 2.4L L4 | NS320583 | 🇺🇸 US | with F4A42 Transmission CodeMitsubishi Transmission | View on Amazon |
| NATIONAL Fits: 2.4L L4 | 320583 | 🇺🇸 US | with Mitsubishi F4A42 Transmission | View on Amazon |
| SCHAEFFLER Fits: 2.4L L4 | SS3759 | 🇺🇸 US | 9 MM Width60.28 mm Outside Diameter | View on Amazon |
| WJB / INMOTION PARTS Fits: 2.4L L4 | WS320583 | 🇺🇸 US | with Mitsubishi F4A42 Transmission | View on Amazon |
This table covers the seals at the Torque Converter Shaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
4 Torque Converter Shaft Seal parts for the 2005 Kia Optima come from 4 brands — BCA, NATIONAL, SCHAEFFLER and 1 other brand.
Listed part numbers: BCA NS320583, NATIONAL 320583 and SCHAEFFLER SS3759, plus the other parts above.
Transmission Fluid
ATF +4
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PENTOSIN Fits: 2.4L L4 | 1058112 | 🇺🇸 US | ATF441 Liter | View on Amazon |
| PENTOSIN Fits: 2.4L L4 | 1058212 | 🇺🇸 US | ATF445 Liters | View on Amazon |
Multi-Vehicle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 2.4L L4 | VV3246 | 🇺🇸 US | Max Life Multi-Vehicle or Maxlife Multi-Vehicle Full Synthetic ATF1 Quart | View on Amazon |
| VALVOLINE Popular Fits: 2.4L L4 | 773775 | 🇺🇸 US | Max Life Multi-Vehicle or Maxlife Multi-Vehicle Full Synthetic ATF1 Gallon | View on Amazon |
| LUBEGARD Fits: 2.4L L4 | 69032 | 🇺🇸 US | 1 QuartComplete Full Synthetic ATF Fluid | View on Amazon |
| VALVOLINE Fits: 2.4L L4 | 822389 | 🇺🇸 US | Import Multi-Vehicle ATF1 Quart | View on Amazon |
| VALVOLINE Fits: 2.4L L4 | 881051 | 🇺🇸 US | Maxlife Multi-Vehicle Full Synthetic ATF5 Gallon Bay Box | View on Amazon |
SP-III (SP3)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 2.4L L4 | 2522003 | 🇺🇸 US | Premium SPIII1 Quart | View on Amazon |
SP-IV (SP 4)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AISIN Fits: 2.4L L4 | ATFSP4 | 🇺🇸 US | SP41 Quart | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: 2.4L L4 | 899179 | 🇺🇸 US | Extended Protection Full Synthetic ATF1 Quart | View on Amazon |
This table covers the automatic-transmission fluids specified for this gearbox. Typical signs include harsh or delayed shifts, fluid that smells burnt, or a shudder at light throttle. Use exactly the specification in the notes. Automatic transmissions are unforgiving of the wrong fluid.
10 Transmission Fluid parts are listed for the 2005 Kia Optima, from VALVOLINE, PENTOSIN, LUBEGARD and 2 other brands. VALVOLINE VV3246 carries the "Popular" badge.
In the ATF +4 grade, PENTOSIN supplies 2 parts: grouped under the catalog's "ATF +4" designation — the notes column spells out what sets them apart. A representative part number is PENTOSIN 1058112.
In the Multi-Vehicle grade, VALVOLINE and LUBEGARD supply 5 parts: grouped under the catalog's "Multi-Vehicle" designation — the notes column spells out what sets them apart. A representative part number is VALVOLINE VV3246.
In the SP-III (SP3) grade, BECK/ARNLEY supplies 1 part: grouped under the catalog's "SP-III (SP3)" designation — the notes column spells out what sets them apart. A representative part number is BECK/ARNLEY 2522003.
The SP-IV (SP 4) section lists 1 option from AISIN — grouped under the catalog's "SP-IV (SP 4)" designation — the notes column spells out what sets them apart. AISIN ATFSP4 is listed in this group.
1 ungrouped part is not assigned to a grade, with the same engine-level match.
Transmission Fluid Additive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LUBEGARD Popular Fits: 2.4L L4 | 19610 | 🇺🇸 US | Instant Shudder Fixx2 oz | View on Amazon |
| LUBEGARD Popular Fits: 2.4L L4 | 60902 | 🇺🇸 US | Automatic Transmission Fluid Protectant10 oz | View on Amazon |
| ATP Fits: 2.4L L4 | AT203 | 🇺🇸 US | Automatic Transmission Fluid Synthetic Modifier | View on Amazon |
| LUBEGARD Fits: 2.4L L4 | 19689 | 🇺🇸 US | Instant Shudder Fixx2 oz | View on Amazon |
| LUBEGARD Fits: 2.4L L4 | 61910 | 🇺🇸 US | 10 ozHighly Friction Modified ATF Supplement | View on Amazon |
| LUBEGARD Fits: 2.4L L4 | 63010 | 🇺🇸 US | Platinum Universal ATF Protectant10 oz | View on Amazon |
| LUBEGARD Fits: 2.4L L4 | 63016 | 🇺🇸 US | Platinum Universal ATF Protectant15 oz | View on Amazon |
| LUBEGARD Fits: 2.4L L4 | 63032 | 🇺🇸 US | Platinum Universal ATF Protectant32 oz | View on Amazon |
This table covers the conditioners and additives used with this transmission fluid.
8 Transmission Fluid Additive parts are listed for the 2005 Kia Optima, from LUBEGARD and ATP. LUBEGARD 19610 carries the "Popular" badge.
This group includes LUBEGARD 19610, LUBEGARD 60902 and ATP AT203 and the remaining parts above.
Transmission Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEA / MARMON RIDE CONTROL Popular Fits: 2.4L L4 | A7117 | 🇺🇸 US | View on Amazon | |
| ANCHOR Fits: 2.4L L4 | 9373 | 🇺🇸 US | Left UpperAutomatic trans. | View on Amazon |
| BECK/ARNLEY Fits: 2.4L L4 | 1041585 | 🇺🇸 US | View on Amazon | |
| PIONEER Fits: 2.4L L4 | 627117 | 🇺🇸 US | View on Amazon | |
| WESTAR Fits: 2.4L L4 | EM9373 | 🇺🇸 US | Automatic trans. | View on Amazon |
This table covers the mounts that hold the transmission to the chassis. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
5 Transmission Mount parts for the 2005 Kia Optima come from 5 brands — DEA / MARMON RIDE CONTROL, ANCHOR, BECK/ARNLEY and 2 other brands. The "Popular" part is DEA / MARMON RIDE CONTROL A7117.
This group includes DEA / MARMON RIDE CONTROL A7117, ANCHOR 9373 and BECK/ARNLEY 1041585 and the remaining parts above.
Buying Automatic Transmission Parts for a 2005 Kia Optima
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Match the engine first. Every automatic transmission part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Filter and Transmission Fluid .
Frequently Asked Questions
How many automatic transmission parts fit the 2005 Kia Optima?
Our catalog currently lists 70 automatic transmission parts for the 2005 Kia Optima across 16 subcategories and 28 brands, covering both the 2.4L L4 and the 2.7L V6. Each part is matched to the engine(s) it fits.
Do automatic transmission parts differ between 2005 Kia Optima engines?
Yes. Every automatic transmission part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of automatic transmission problems on a 2005 Kia Optima?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2005 Kia Optima was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2005 Kia Optima?
First match the engine — each row shows which engine(s) the part fits. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2005 Kia Optima
Automatic Transmission Parts for Other Kia Optima Years
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