Does IS300 have 2JZ or 1JZ?
The IS300 uses the 2JZ-GE engine, not the 1JZ.
In the U.S. market and most regions where the model was sold as the IS300, the first-generation Lexus IS300 (2001–2005) was powered by a 3.0-liter inline-six known as the 2JZ-GE, a naturally aspirated member of Toyota’s JZ engine family. The 1JZ family—encompassing the 1JZ-GE and the turbocharged 1JZ-GTE—belongs to a different line of Toyota engines and was used in other models such as certain Supras and Soarers, but not as a factory IS300 engine.
To provide a quick reference, here are the core distinctions between the two engine families as they relate to the IS300:
- Stock IS300 engine: 2JZ-GE, 3.0L inline-six, naturally aspirated. No factory 1JZ option in IS300.
- 1JZ-GTE vs 2JZ-GE: 1JZ-GTE is the turbocharged variant used in other models; 2JZ-GE is the non-turbo version used in the IS300.
- Aftermarket swaps: Some owners swap engines (including 1JZ variants) into IS300s, but these are aftermarket configurations and not factory specifications.
In summary, the factory IS300 engine is 2JZ-GE. The 1JZ family is a separate lineage used in other Toyota/JDM platforms.
Further context for enthusiasts
Understanding the correct engine helps with maintenance, parts sourcing, and potential upgrades. The 2JZ-GE is well-supported in the enthusiast community, with many compatible components and documented repair paths, whereas the 1JZ-GTE is associated with turbocharged builds on different models.
Technical snapshot
2JZ-GE: 3.0-liter inline-six, naturally aspirated; part of the JZ family and used in the IS300 during its early run; designed for reliability and broad parts availability. 1JZ-GTE/1JZ-GE: other variants in the JZ family used in different platforms, with the GTE being turbocharged.
Summary: The Lexus IS300 is powered by the 2JZ-GE engine, not the 1JZ. While the 1JZ family exists in Toyota’s lineup, it does not come from the factory in the IS300. Enthusiasts should look for 2JZ-GE documentation and parts when discussing a stock IS300, while any 1JZ references should be understood as potential aftermarket swaps rather than factory specifications.
Which Lexus uses 2JZ?
While the twin-turbo 2JZ-GTE is the one that everyone wants, the naturally aspirated 2JZ-GE variant of the engine was also celebrated and found in a larger number of Toyota and Lexus vehicles. Lexus took full advantage of the 2JZ, using it in most of their earlier vehicles including the SC300, GS300, and IS300.
Is the 1JZ or 2JZ better?
“The reason most people think that the 2JZ is stronger is because it can hold up to higher power levels. But, they fail to account for the extra displacement. A general rule of thumb is that the 1JZ stock bottom end is good for about 650-700 horsepower, and the stock 2JZ bottom end is good for about 800 horsepower.
Does the Lexus IS300 have a 2JZ?
Yes, the Lexus IS300 (specifically the first generation, 2001-2005) is powered by the naturally aspirated 2JZ-GE engine, a version of the iconic inline-six that was also used in the Toyota Supra. This engine was a key feature for the model, known for its durability and smooth performance, and remains popular with enthusiasts who often swap in the turbocharged 2JZ-GTE engine for more power.
Engine specifications and features
- Engine: The IS300 features the 2JZ-GE, a 3.0-liter, naturally aspirated inline-six engine.
- Power: It produces around 215–217 horsepower and 218 lb-ft of torque.
- Shared heritage: This is the same engine family as the legendary 2JZ-GTE found in the Toyota Supra, though the IS300's version is not turbocharged from the factory.
- Aftermarket support: The 2JZ-GE engine's reputation for being overbuilt and reliable makes it a popular choice for modifications, especially turbocharger swaps.
Engine swaps
- The ability to swap in the more powerful 2JZ-GTE engine is a significant reason for the IS300's popularity in the tuning community, making it a sought-after "sleeper" car.
- Many IS300s in the aftermarket have been modified to include the turbocharged engine, sometimes with significant upgrades to the internal components to handle the extra power.
What engine does the IS300 use?
The Lexus IS 300 has two engine options, depending on the model and drivetrain: a standard 2.0-liter turbocharged four-cylinder or an available 3.5-liter V6 for all-wheel drive models. Older models, like the first-generation IS 300 (1999-2005), came with a 3.0-liter inline-six engine.
Modern IS 300
- 2.0-liter turbocharged inline-4: This is the standard engine for the rear-wheel-drive model, producing around 241 horsepower.
- 3.5-liter V6: This engine is an option for the all-wheel-drive IS 300 and is also standard on the IS 350 models, providing higher horsepower.
First-generation IS 300
- 3.0-liter 2JZ-GE inline-six: This was the engine used in the first-generation IS 300 from 1999 to 2005.
