Is the IS250 a V4 or V-6?
The IS250 uses a V6 engine, not a four-cylinder.
In detail, the Lexus IS250 is powered by a 2.5-liter V6 that has been used in various markets with either dual VVT-i and, in some variants, direct injection. It delivers roughly 204 horsepower and about 185 lb-ft of torque, offering a refined, smooth performance that distinguishes it from four-cylinder rivals. The following sections lay out the key specs, how the engine behaves in everyday driving, and what owners should know for maintenance and reliability.
Engine configuration and core specifications
Key facts about the IS250’s engine at a glance:
- Displacement: 2.5 liters (2,499 cc)
- Configuration: V6
- Valvetrain: DOHC, 24 valves
- Induction and injection: Dual VVT-i on intake and exhaust cams; some markets use direct injection within the 4GR-FSE family
- Power output: approximately 204 hp (about 152 kW) at around 6,400 rpm
- Torque: roughly 184–185 lb-ft (about 250 Nm) at around 4,000 rpm
- Engine family: 4GR-FSE (the common designation for the IS250’s 2.5L V6 in many markets)
- Fuel system: varies by market, with configurations including both port and direct injection in certain variants
The IS250’s engine is typically mounted to a six‑speed automatic transmission (with drive configurations offered as rear-wheel drive and, in some markets, all-wheel drive). A timing chain drives the cams, contributing to durability and different maintenance considerations compared with belt-driven engines.
Performance, economy and upkeep
What to expect in daily use and how to care for the engine over time:
- Performance feel: a smooth, strong mid‑range with ready torque, suitable for daily driving and comfortable highway cruising
- Fuel economy:Typically in the mid‑20s mpg combined range for many IS250 configurations, with variations based on drivetrain (RWD vs AWD) and model year
- Drivetrain options: rear‑wheel drive is common, with all‑wheel drive available in some markets and years
- Maintenance basics: regular oil changes with the recommended synthetic oil, periodic inspection of cooling and cooling-system components, and attention to the timing chain and related tensioners as part of routine service
- Reliability notes: the 2.5L V6 in the IS250 is generally durable when maintained to schedule; aging cooling components and carbon buildup on some direct-injection variants can require attention in higher-mileage cars
- Parts and service: broad availability through Lexus/Tremium Toyota service networks and aftermarket suppliers, given the engine’s long production history
Understanding these factors helps owners plan maintenance intervals and grasp how the IS250’s V6 design influences performance and ownership costs.
Summary
The IS250 is powered by a V6 engine, not a four-cylinder, featuring a 2.5-liter displacement and a 4GR-FSE‑style family of design with dual VVT-i and optional direct injection in certain markets. It delivers a balance of refined power and efficiency for a midsize luxury sedan of its era, with maintenance requirements typical for Toyota/Lexus V6 engines. This makes the IS250 distinct from four-cylinder rivals while offering dependable performance when properly cared for.
