KiaOptima Hybrid2015Overview/kia/optima-hybrid/2015/base/

2015 Kia Optima Hybrid

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2015 Optima Hybrid.

Body PASSENGER CARTransmission Automatic (AM6)

The 2015 Kia Optima Hybrid is a passenger‑car sedan that relies on a 5.1‑quart oil capacity with a recommended 5W‑30/10W‑30 API viscosity and is paired with an Automatic (AM6) transmission, delivering EPA‑rated fuel economy of 35/38/37 mpg. With zero recalls and only twelve total owner complaints—primarily concerning the engine—this model year shows a markedly lower problem count than the model’s peak of 201 complaints in 2019 and is far above the single complaint recorded for 2020. Consequently, the 2015 Optima Hybrid occupies a favorable spot in the vehicle’s reliability timeline, indicating a period of comparatively dependable operation before the later surge in issues.

Model year20182017201620152014201320122011

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity5.1 qtOEM · verified
Engine oil type5W-30 / 10W-30 APIOEM · verified
EPA fuel economy35/38/37 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 48 · 760 CCA battery. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 48 · 760 CCAOEM · verified
Tail / brake / turnOFFOEM · verified
Tire sizeP215/55R17OEM · verified
Wheel / rim6.5 inOEM · verified

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (AM6)

Dimensions & weight NHTSA vPIC

Overall length190.6 in
Overall width72 in
Overall height57.1 in
Wheelbase110.2 in
Curb weight3497 lb
Track (front / rear)62.2 / 62.2 in
Weight distribution (front / rear)60/40

Ratings & economy EPA / vPIC

EPA city / highway / combined35 / 38 / 37 mpg
DrivetrainFront-Wheel Drive
Passenger volume102 cu ft
Cargo volume11 cu ft
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 5.1 qt of 5W-30 / 10W-30 API engine oil, DOT 3 brake fluid. Torque the oil drain plug to 29.0 ft-lbs. The firing order is 1-3-4-2. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.

Lubricants & capacities

Automatic Transmission FluidATF
Automatic Transmission Fluid Capacity8.2
Automatic Transmission FluidATF
Automatic Transmission Fluid Capacity7.5
Brake FluidDOT 3
Engine CoolantEthylene Glycol
Engine Coolant Capacity6.9
Engine CoolantEthylene Glycol

Engine torques

Crankshaft Pulley and/or Damper Bolts123-130 ft-lbs
Crankshaft Pulley and/or Damper Bolts123-130 ft-lbs
Intake Manifold to Engine Bolts14
Exhaust Manifold to Cylinder Head Bolts36
Intake Manifold to Engine Bolts14
Engine Oil Pan Drain Plug29.0 ft-lbs

Chassis torques

Steering Track (Rod End) Bolts22.0-33.0 ft-lbs
Front Wheel Hub159-188 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Curb Idle Speed (No Load)600-800 rpm
Curb Idle Speed (No Load)500-700 rpm
Spark Plug ManufacturerKia
Spark Plug Gap.028 - .031 in
Spark Plug Torque11-18 ft-lbs
Ignition Timing6 degrees
Ignition Timing Acceptable Variance10 degrees

Battery & A/C

RefrigerantR134a
Refrigerant Capacity18.56-20.32 lbs
Oil GroupPAG
Oil Type46
Oil Capacity3.035-3.750 oz
RefrigerantR134a
Refrigerant Capacity22.80-24.00 lbs
Oil GroupPAG

Service checks

Regulated Fuel System Pressure (With Vacuum)72-73 psi
Regulated Fuel System Pressure (With Vacuum)48-51 psi
Engine Compressionpsi 135-156 / max variation 15 psi
Engine Compressionpsi 171-192 max variation 15 psi
Intake Valve Lash0.0067-0.0090 in
Exhaust Valve Lash0.0126-0.0150 in
Intake Valve Lash0.0067-0.0090 in
Exhaust Valve Lash0.0106-0.0129 in

Brakes

Brake Caliper Bolt to Carrier TorqueFront or rear: 16-23 / 16-23
Brake Caliper Carrier to Hub Bolt TorqueFront: 58-; Rear: 47-; Front: 58-; Rear: 47-
ABS Sensor Torque6 / NS
Minimum Pad Thickness0.079 in
Minimum Shoe Thickness0.039 in
Vented Rotor Minimum Thickness for ReplacementFront: 1.039; Rear: .330
Variation from Parallelism Thickness VariationFront: .0002; Rear: .0004
Maximum Rotor RunoutFront: .0016; Rear: .0020

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 3 stages

Prep Do not reuse old bolts. Do not allow oil on cylinder head bolts. Apply Loctite 5900H or equivalent on the front edge of the cylinder head gasket. Both the upside and the down side. Assembly of the cylinder head must be completed within five minutes of applying the liquid gasket compound.

124.0-27.0 ft. lbs.24–27 ft. lbs
290 degrees-95 degrees90 degrees
390 degrees-95 degrees90 degrees
Cylinder Head — tightening sequence 3 stages

Prep Do not reuse old bolts. Do not allow oil on cylinder head bolts. Apply Loctite 5900H or equivalent on the front edge of the cylinder head gasket. Both the upside and the down side. Assembly of the cylinder head must be completed within five minutes of applying the liquid gasket compound.

124.0-27.0 ft. lbs.24–27 ft. lbs
290 degrees-95 degrees90 degrees
390 degrees-95 degrees90 degrees
Cylinder Head — tightening sequence 3 stages

Prep Do not reuse old bolts. Do not allow oil on cylinder head bolts. Apply Loctite 5900H or equivalent on the front edge of the cylinder head gasket. Both the upside and the down side. Assembly of the cylinder head must be completed within five minutes of applying the liquid gasket compound.

124.0-27.0 ft. lbs.24–27 ft. lbs
290 degrees-95 degrees90 degrees
390 degrees-95 degrees90 degrees
Cylinder Head — tightening sequence 3 stages

Prep Do not reuse old bolts. Do not allow oil on cylinder head bolts. Apply Loctite 5900H or equivalent on the front edge of the cylinder head gasket. Both the upside and the down side. Assembly of the cylinder head must be completed within five minutes of applying the liquid gasket compound.

124.0-27.0 ft. lbs.24–27 ft. lbs
290 degrees-95 degrees90 degrees
390 degrees-95 degrees90 degrees

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter at 3,000 mi; spark plugs at 105,000 mi; coolant every 30,000 mi. The big-interval services (every 30,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

At 3,000 miEngine Oil (drain & refill) · Engine Oil Filter (replace)
Every 5,000 miEngine Oil (drain & refill) · Engine Oil Filter (replace)
Every 7,500 miAccessory Drive Belt (inspect) · Engine Air Filter Element (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate) · Vacuum Line (inspect)
Every 15,000 miAccessory Drive Belt (inspect) · Air Conditioning System (inspect) · Brake Line (inspect) · Brake Linings (inspect) · Brake Rotor (inspect) · CV Joint Boot (inspect)
Every 30,000 miBrake Hydraulic System (inspect fluid level) · Engine Coolant System (drain, flush & refill) · Fuel Evaporative Canister Filter (inspect) · Fuel Evaporative Emission Control System Lines (inspect) · Fuel Filter (inspect) · Fuel Line (inspect)
At 60,000 miAccessory Drive Belt (inspect)
Every 60,000 miDrive Belt (replace) · Engine Valves (inspect valve lash)
At 105,000 miSpark Plugs (replace)
At 120,000 miEngine Coolant System (drain, flush & refill) · Hybrid Inverter (drain, flush & refill coolant)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The federal record indicates a downward trend in consumer complaints leading to the 2015 model year, dropping significantly from the 107 reports filed for the 2012 model. With only 12 complaints and zero recalls, the 2015 Optima Hybrid sits at a low point in the generation's reliability arc, comparable to the 2016 model year's four complaints. Although the data notes two fire complaints and top issues listed under engine and electrical systems, the record does not specify the root causes for these incidents. This period of stability stands in contrast to the 2019 model year, which experienced a sharp anomaly of 201 complaints later in the timeline. Based on the low volume of complaints and absence of recalls during this period, the 2015 model year presents a statistically sound choice for used buyers.

0
Open recalls
NHTSA campaigns
124
Service bulletins
Manufacturer communications
3
ODI investigations
Office of Defects Investigation
12
Owner complaints
0 involved a crash · 2 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★★
Side★★★★★
Rollover★★★★★
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 12 complaints on record, top 8 components.

Engine2
Electrical System2
Electrical System,Engine2
Power Train1
Electrical System,Unknown Or Other,Engine1
Structure1
Exterior Lighting1
Steering1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

Technical service bulletins NHTSA · verified

Showing 5 of 124 bulletins on record with NHTSA.

BulletinDateComponentSummary
PI2104_OWNR_5012026-03-18Electrical SystemPRODUCT IMPROVEMENT CAMPAIGN: OWNER RENOTIFICATION (PI2104 FLIGHT 501) - This document is…
PS7972025-12-09Back Over PreventionPITSTOP: TECHNICAL OPERATIONS: EXTERNAL DAMAGE TO ULTRASONIC SENSOR: This Pitstop…
PI2104_OWNR_4012025-07-15Electrical SystemPRODUCT IMPROVEMENT CAMPAIGN: OWNER RENOTIFICATION (PI2104) - This document is the owner…
TSB_TRA046_R52025-04-17Power TrainTECHNICAL SERVICE BULLETIN: TRANSMISSION FLUID APPLICATION GUIDE - This bulletin has been…
SC269_OWNR_3012025-03-25Electrical SystemVOLUNTARY SERVICE CAMPAIGN: OWNER RENOTIFICATION (SC269) - This document is the owner…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

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VIN
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Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
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Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 2015 Optima Hybrid take?

5.1 qt of Preferred oil 5W-30 ACEA A5/B5 API Certification. Above 0 degreesF 10W-30 ACEA A5/B5 API Certification., per the factory manual.

Does the 2015 Optima Hybrid have open recalls?

NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Optima Hybrid get?

EPA figures are 35 city / 38 highway / 37 combined mpg.