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1998 Kia Sephia

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1998 Sephia.

Transmission Automatic 4-spd

The 1998 Kia Sephia, equipped with a 4‑speed automatic transmission and an engine requiring 4.2 quarts of 10W‑40, 10W‑50, or 5W‑20 oil, returned EPA fuel economy of 20 city, 29 highway, and 23 combined mpg. Within the model’s 1994–2003 run, the 1998 year stands out as the most problematic, accumulating 713 owner complaints—far more than any other year—with the top issue centered on the service brakes and hydraulic system, alongside six recalls. This places the 1998 Sephia at the low point of the model’s reliability history, making it a year to scrutinize closely for brake-related concerns.

Model year2001 2000 1999 1998 1997 1996 1995

Quick specs

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

Engine oil capacity4.2 qtOEM · verified

Engine oil type10W-40 / 10W-50 / 5W-20 APIOEM · verified

Lug nut torque65-87 ft-lbsOEM · verified

EPA fuel economy20/29/23 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 90 · 450 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 90 · 450 CCAOEM · verified

Tail / brake / turnFUSEOEM · verified

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic 4-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined	20 / 29 / 23 mpg
Drivetrain	Front-Wheel Drive
Passenger volume	94 cu ft
Cargo volume	10 cu ft
Recommended fuel	Regular Gasoline

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

Independent road tests for the Sephia of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

8.7–10.7 sec0–60 mph (tested)quickest 8.70 sec — 1997 LS Sedan

Year	Trim / engine	0–60	¼ mile	HP	Drivetrain
1997	LS Sedan 1.8L I-4	8.70 sec	16.60 sec	122 hp	FWD
2000	LS Sedan 1.8L I-4	10.20 sec	17.60 sec	122 hp	FWD
1995	LS Sedan 1.8L I-4	9.90 sec	17.50 sec	122 hp	FWD
1995	LS Sedan 1.8L I-4	10.70 sec	18.00 sec	122 hp	FWD

Service quick specs OEM factory data

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

This engine holds 4.2 qt of 10W-40 / 10W-50 / 5W-20 API engine oil, DOT 3 · DOT 4 brake fluid. Torque lug nuts to 65-87 ft-lbs. The firing order is 1-2-3-4-5-6. 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

Brake Fluid	DOT 3 · DOT 4
Engine Coolant	ETHYLENE GLYCOL
Engine Oil	10W-40 · 10W-50 · API · 5W-20 · 5W-30
Engine Oil Capacity	4.2 qt

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs	Tighten in 5 or 6 steps to 8-10 ft-lbs
Connecting Rod (Large End) Bearings	35-37 ft-lbs
Engine Flywheel Bolts	71-76 ft-lbs
Intake Manifold to Engine Bolts	14-19 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	28-34 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs	14-19 ft-lbs

Chassis torques

Lug Nuts	65-87 ft-lbs
Front Wheel Hub	154-205 ft-lbs
Rear Wheel Hub	180 ft-lbs

Ignition

Cylinder Firing Order	1-3-4-2
Cylinder Firing Order	1-2-3-4-5-6
Curb Idle Speed (No Load)	800 rpm
Curb Idle Speed Variance (No Load)	50 rpm
Spark Plug Gap	0.039-0.0.043 in
Spark Plug Torque	11.0 ft-lbs
Ignition Timing	8, Not adjutstable degrees
Ignition Timing Acceptable Variance	5 degrees

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	1.54 lbs
Oil Group	PAG
Oil Type	46
Oil Capacity	6.08 oz
Standard BCI Group Number	90
Standard BCI Cranking Performance	450 cca

Service checks

Pressure Test	15 psi
Radiator Cap Pressure Relief	11-15 psi
Injector Primary Resistance	14.5 @ 68 degreesF ohms
Engine Compression	142-186 PSI. 25 Maximum variation PSI.
Intake Valve Lash	Hydraulic in
Exhaust Valve Lash	Hydraulic in

Brakes

Brake Application	WITH REAR DISC / WITH STANDARD
Torque to Knuckle	18-24 ft-lbs / 76 ft-lbs
Torque Caliper to Bracket	18-24 ft-lbs
Minimum Pad Thickness	0.080 in
Minimum Shoe Thickness	0.040 in
Brake Application	WITH REAR DISC / WITH STANDARD
Rotor Runout Limit	0.0039 in
Rotor Nominal Thickness From	0.394 in / 0.787 in

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 5 stages

1	36 ft. lbs.	36 ft. lbs
2	loosen 1 turn
3	29 ft. lbs.	29 ft. lbs
4	90 degrees	90 degrees
5	90 degrees	90 degrees

Main Bearings — tightening sequence 1 stages

29 ft. lbs., Step 2: backoff 360 degrees, Step 3: 15 ft. lbs., Step 4: 90 degrees, Step 5: 60

29 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 7,500 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.

Every 7,500 mi	Engine Oil (drain & refill) · Engine Oil Filter (replace)
Every 30,000 mi	Brake System (inspect) · CV Joint Boot (inspect) · Engine Coolant System (drain, flush & refill) · Transmission Assembly (drain & refill)
Every 60,000 mi	Fuel Filter (replace)
At 105,000 mi	Fuel Line (replace)

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 1998 Kia Sephia sits at the crest of a steeply rising federal record, with 713 complaints more than doubling the 266 reported for 1997 and establishing the generation’s peak. That year generated 6 recalls, 12 investigations, and 19 TSBs—all highs for the model run—while subsequent years show a clear retreat, with 2000 falling to 340 complaints and 1 recall. Although 1999 remained elevated at 518 complaints and 5 recalls, 1998 marks the inflection point where the model’s federal footprint began contracting, confirming it as the worst year in the documented arc. Owner filings for 1998 were concentrated in the Service Brakes, Hydraulic category with 189 reports, followed by 85 Engine & Engine Cooling complaints, 78 Electrical System complaints, and 30 Fuel System, Gasoline complaints, plus 34 crash complaints and 16 fire complaints, though the data does not specify underlying causes. Because this model year captures the maximum level of reported problems, recalls, and regulatory scrutiny for the entire run, it carries the highest statistical exposure to the issues that drove that volume. Consequently, the 1998 model is the least favorable year to buy within this generation.

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

713

Owner complaints

34 involved a crash · 16 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’94 ’95 ’96 ’97’98’99 ’00 ’01 ’02 ’03

Owner complaints filed with NHTSA, by component

All 713 complaints on record, top 8 components.

Service Brakes, Hydraulic189

Engine & Engine Cooling85

Electrical System78

Fuel System, Gasoline30

Power Train30

Visibility30

Air Bags24

Exterior Lighting22

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 6 campaigns on record for this vehicle.

99V318000Fuel System, Gasoline:Delivery:Fuel PumpReported 09/11/1999

VEHICLE DESCRIPTION: PASSENGER VEHICLES. THE ELECTRICAL CIRCUIT FOR THE FUEL PUMP IS GROUNDED AT JUNCTION CONNECTOR G300. IF THE PIN TENSION IS POOR, OR THE BOLT SECURING THE CONNECTOR TO THE VEHICLE FLOOR IS NOT… Remedy: THIS CORRECTIVE ACTION IS BEING PERFORMED IN CONJUNCTION WITH RECALL NO. 99V317.

99V317000Fuel System, Gasoline:Delivery:Fuel PumpReported 09/11/1999

VEHICLE DESCRIPTION: PASSENGER VEHICLES. ELECTRICAL CURRENT TO THE FUEL PUMP PASSES THROUGH THE C304 AND C305 CONNECTORS. IF EXPOSED TO MOISTURE, THESE CONNECTORS COULD CORRODE. OVER TIME, THE FUEL PUMP WILL NOT RECEIVE… Remedy: DEALERS WILL REPLACE THE EXISTING CONNECTORS AND REPOSITION THOSE CONNECTORS TO AN AREA WHERE THE PLACEMENT IS DESIGNED TO PREVENT CONTACT WITH MOISTURE.

Technical service bulletins NHTSA · verified

Showing 5 of 19 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
TSB_BOD055_R1	2021-09-13	Structure	TECHNICAL SERVICE BULLETIN: INFORMATION FOR HEADLAMP CONDENSATION AND MOISTURE - This…
PS539	2018-03-02	Engine And Engine Cooling	PITSTOP - ENGINE COMPONENT RE-USE GUIDELINES - In general, parts and components removed…
TSB-GEN085R1	2017-01-18	Equipment	TSB: MANDATORY REPLACEMENT OF LOCKING/SECURITY HARDWARE - By design, certain fasteners…
TSB-GEN085	2016-11-04	Latches/Locks/Linkages	TSB: MANDATORY REPLACEMENT OF LOCKING/SECURITY HARDWARE - By design, certain fasteners…
TSBTRA046	2013-12-06	Power Train	TSB: AUTOMATIC TRANSMISSION FLUID APPLICATION GUIDE - THIS BULLETIN PROVIDES INFORMATION…

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

Decode factory build data for a specific vehicle by VIN.

VIN

Decode a VIN to confirm the transmission and build data for a specific Sephia. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

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

Group 90 battery Vehicles taking 4.2 qt

Reference guides

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

Vehicle recalls & TSBs OBD-II trouble codes Torque specifications Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 1998 Sephia take?

4.2 qt of ABOVE -15 degrees F: 10W-40 OR 10W-50 API, BELOW -15 degrees F: 5W-20 OR 5W-30 API, ABOVE 85 degrees F 40W API STARBURST, per the factory manual.

Does the 1998 Sephia have open recalls?

NHTSA lists 6 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the Sephia get?

EPA figures are 20 city / 29 highway / 23 combined mpg.