2004 Lexus

ISSedan

Sedan

The 2004 Lexus IS 300 is the first-generation IS (XE10 platform) in its final model year, powered by a 3.0L inline-six borrowed from the Supra and mated to either a 5-speed automatic or a rare 5-speed manual. It was Lexus's answer to the BMW 3 Series — rear-wheel drive, driver-focused, and built with Toyota's legendary fit and finish. At this age, most examples have crossed the 150k-mile mark, so condition varies widely. The 2JZ-GE engine in this car is one of the most bulletproof inline-sixes ever put in a production car. When maintained properly — particularly with regular oil changes — it will run well past 200k miles. The weak links tend to be age-related: suspension bushings, differential seals, and the occasional VVT-i system fault from neglected oil changes. Buying a 20-year-old sport sedan means you're inheriting two decades of whoever owned it before. These cars attract enthusiasts who maintain them obsessively and also people who thrash them and defer everything. A thorough pre-purchase inspection is non-negotiable.

Reliability

4/5

Verified data

Specs shown for IS 300 — the most common configuration. Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.

Engine

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Drivetrain

RWD

Fuel

Premium gasoline

MPG

16 city / 23 hwy / 18 combined

Seats

—

Doors

—

Body

Compact Cars

Overview

AI-curated

Known for

Bulletproof 2JZ-GE 3.0L inline-six engine
Rear-wheel drive handling in a luxury package
Exceptional long-term build quality and interior durability
Cult following among enthusiast and tuner communities
Tight, sport-biased ride with accurate steering

Best for

Driving enthusiasts who want rear-wheel drive luxury
Owners willing to do proper preventive maintenance
Buyers looking for a long-lasting used sport sedan under $15k
City and highway commuters comfortable with premium fuel costs

Watch for

VVT-i oil control valve sludge from infrequent oil changes
High-mileage rear differential seal leaks
Neglected cooling systems on 20-year-old examples
Modified or tracked examples with hidden wear
Rust on undercarriage, especially on Wisconsin/salt-belt cars

Common issues by mileage

6 known

VVT-i Oil Control Valve Sludge / Camshaft Timing Faults

medium

Typically appears: 80–150k mi
Estimated repair: $300 – $900

P0012 P0015 P0022 P0025

VVT-i Solenoid Circuit Faults (Intake/Exhaust Valve Control)

medium

Typically appears: 80–160k mi
Estimated repair: $150 – $500

P0026 P0027 P0028 P0029

Oxygen / Air-Fuel Sensor Heater Circuit Failure

medium

Typically appears: 100–180k mi
Estimated repair: $200 – $550

P0030 P0031 P0032 P0036

Rear Differential Seal Leak

medium

Typically appears: 100k+ mi
Estimated repair: $200 – $500

Suspension Bushing Deterioration

high

Typically appears: 100k+ mi
Estimated repair: $400 – $1,200

Cooling System Component Fatigue

medium

Typically appears: 120k+ mi
Estimated repair: $300 – $900

Maintenance schedule

1
Every 5,000 miles or 6 months Engine oil and filter change — use 5W-30 full synthetic

The 2JZ-GE's VVT-i system is highly sensitive to oil cleanliness and viscosity. Extended intervals cause sludge that clogs oil control valves and kills the variable timing hardware. This is the single most important maintenance item on this car.
2
Every 2 years or 30,000 miles; inspect hoses and cap annually Coolant flush and inspection of hoses, thermostat, and radiator

Any 20-year-old car with original cooling components is living on borrowed time. Fresh Toyota red coolant (SLLC) at the right concentration protects the aluminum head and keeps the thermostat accurate.
3
Every 30,000 miles; inspect for leaks every oil change Rear differential fluid change

RWD cars need healthy diff fluid. Wisconsin salt accelerates seal wear — check the pinion and axle seals at every oil change and address any seeping immediately.
4
Every 30,000–45,000 miles Transmission fluid change (automatic)

Toyota/Lexus recommends Type IV ATF. Many used examples have no record of this service. Fresh fluid dramatically extends transmission life and improves shift feel.
5
Every 60,000 miles Spark plug replacement — use OEM iridium plugs

The 2JZ fires on six cylinders; worn plugs stress the ignition coils and reduce fuel efficiency. Use Lexus/Denso iridium plugs to spec — cheaper plugs cause misfires in this engine.
6
Every 15,000 miles or annually Suspension and undercarriage inspection (bushings, CV boots, differential seals)

Wisconsin roads and road salt destroy rubber and seals faster than anywhere in the country. Budget for at least one round of bushing replacement on any high-mileage example.
7
Every 2 years Brake fluid flush

Brake fluid is hygroscopic and absorbs moisture over time, lowering boiling point. On a sport sedan with aggressive braking potential, fresh fluid is a safety item.
8
Test every fall; replace every 3–5 years Battery test and replacement if needed

Sub-zero Wisconsin winters kill weakened batteries without warning. The IS 300's electrical system is sensitive to low voltage — a failing battery can trigger spurious network and sensor fault codes.

Always defer to the manufacturer's service manual for warranty-mandated intervals.

Cost of ownership

Annual maintenance

$800 – $2,000

Fuel

Requires premium fuel (91+ octane). At current Wisconsin pump prices and typical mixed driving, expect $2,200–$3,000/year at 12,000 miles annually.

Insurance

Moderate — sport sedan classification and RWD may push liability/collision rates slightly higher than comparable FWD sedans. Expect $900–$1,500/year for a clean-record adult driver in Lake Geneva.

A well-maintained IS 300 is a relatively affordable sport sedan to keep on the road — parts availability is good, independent shop labor is reasonable, and the engine doesn't nickel-and-dime you the way some European competitors do. The big cost risks are deferred maintenance catching up (VVT-i repairs, cooling system, rear suspension) and premium fuel every fill-up. Budget a one-time deferred maintenance catch-up of $1,000–$2,500 when buying a high-mileage example.

Seasonal care

Lake Geneva, WI

Winter

Switch to a dedicated winter tire set — RWD + Wisconsin snow is a bad combination on all-seasons. This is not optional in Lake Geneva.
Test the battery every October. Cold-cranking amps drop sharply below 0°F and this engine needs a strong crank to fire the 2JZ reliably.
Use -40°F rated washer fluid. The low cowl and windshield angle collect road spray quickly — running out of fluid in a Wisconsin winter is a visibility emergency.
Flush and check coolant concentration (should protect to at least -34°F). Old or diluted coolant can freeze in the block.
Rinse the undercarriage every 2 weeks during salting season — particularly the rear differential, brake lines, and subframe mounts where salt packs in.
Check tire pressure monthly. Pressure drops ~1 PSI for every 10°F temperature decrease; an IS 300 at the wrong pressure on snow is genuinely dangerous.

Summer

Check tire pressure after the first hot week — pressures rise with heat and may need adjustment to stay within spec.
Inspect the A/C system including cabin filter and condenser fins. The IS 300's A/C is effective but the condenser can clog with 20 years of debris.
Watch engine temperature closely on hot days, especially in stop-and-go traffic. A marginally failing thermostat or low coolant that goes unnoticed in winter will show itself in July.
Inspect rubber cooling hoses for soft spots, cracks, or swelling — heat cycles accelerate deterioration on aging hoses.

Comparable vehicles

2004 BMW

3 Series

The car the IS 300 was directly designed to compete with. Similar RWD sport sedan mission and price point; BMW has higher maintenance costs at this age but similar driver engagement.