The Oldsmobile Alero was equipped with two main engine options: a 2.4-liter Ecotec four-cylinder and a 3.4-liter V6.
Across its 1999–2004 production run, the 2.4-liter Ecotec powered most Alero models, while the 3.4-liter V6 was available on higher-trim variants (notably the GT) to provide additional performance.
Engine options
Here are the two engine choices that appeared in the Alero lineup:
- 2.4-liter Ecotec inline-four (approximately 150–155 horsepower)
- 3.4-liter V6 (approximately 170–180 horsepower)
These two engines covered the full range of Alero performance, from economical daily driving to higher-trim GT acceleration.
How to identify the engine in your Alero
To confirm which engine is in your Alero, check the engine code stamped on the engine block, consult the vehicle identification number (VIN) details, or review the original window sticker or owner's manual. If you have access to service records or a dealership, they can verify the exact engine specification for your specific vehicle.
Summary
In brief, the Oldsmobile Alero was powered by either a 2.4-liter Ecotec four-cylinder or a 3.4-liter V6, with the 2.4L serving most models and the 3.4L being the optional upgrade on higher trims.