Motors Compatible With a 2001 Oldsmobile Alero


The 2001 Oldsmobile Alero came with two engine choices: a 2.4-liter in-line four-cylinder and an optional 3.4-liter V-6. The Alero shared many components, including engines, with the Chevrolet Malibu and Pontiac Grand Am as mid-size, front-wheel drive GMX130-platform passenger cars. Oldsmobile produced the Alero from 1999 to 2004. Common engine swaps included replacing the four-cylinder engine with the 3.4-liter V-6 or a 3.5-liter V-6.


  • Oldsmobile introduced the Alero in 1999 to replace the Achieva. The Alero came as a four-door sedan or two-door coupe with the base GX, mid-range GL and upscale GLS trim levels. The four-cylinder engine delivered an adequate 150 horsepower and 155 foot-pounds of torque, while the 3.4-liter V-6, which was an option on the GL and standard equipment on the GLS, produced 170 horsepower and 200 foot-pounds of torque. A four-speed automatic complemented the engines, although in 2001 an optional five-speed manual was available for the four-cylinder models.


  • The most common compatible engine for the 2001 Olds Alero is the LA1 3400 3.4-liter V-6 engine. This optional V-6 engine for Aleros usually is the alternative for Alero owners wishing to replace the 2.4-liter four-cylinder. The engine debuted in 1996, but owners installing this engine should use one from a post-2000 GM car to ensure the wiring harness and computer components are compatible. The 3.4-liter V-6 can be found in the 2000 and later Olds Silhouette, Pontiac Montana, Aztek and Grand Am, Chevrolet Impala, Venture and Monte Carlo, and Buick Rendezvous. The 2000 to 2002 V-6 engines had a tendency to leak from the lower intake manifold and need replacement. A major expense beyond the engine is to replace the existing transmission matching the four-cylinder with an Olds GMX130-platform V-6 compatible transmission. The engine bay that originally contained the four-cylinder can easily accommodate the 3.4-liter V-6. Any V-6 larger than 4 liters is not compatible and would require extensive modifications. Swappers should consider that the 3.4 V-6 from the Impala and Monte Carlo generate 10 more horsepower than the Alero’s V-6. The V-6 from the Venture, Aztek, Rendezvous and Silhouette produced 185 horsepower. The Grand Am GT’s version generated 175 horsepower, but the standard Grand Am’s output was identical to the Alero.

3.1-Liter V-6

  • The General Motors 3100 series L82 3.1-liter V-6 is compatible with the 2001 Alero, but provides only a marginal improvement in overall performance, adding just 10 horsepower to the four-cylinder version with 185 foot-pounds of torque. This engine fits the Alero engine bay, although the wiring harness and computer components must be replaced because the engine came from pre-2000 Buick, Chevy, Olds and Pontiac models. An easier fit is the LG8 3.1-liter V-6 that began production in 2000 and generated 175 horsepower and 190 foot-pounds of torque. This engine is found in the 2000 and later Pontiac Grand Prix SE, Buick Century, and Chevy Lumina and Malibu.

3.5-liter V-6

  • General Motors' LX9 3500 3.5-liter V-6 is a relatively easy swap for the LA1 3.4- or LG8 3.1-liter V-6s. The 3.5-liter version debuted in the 2004 Chevrolet Malibu, and is quieter and runs more smoothly than any of the previous GM V-6 engines. It fits into an Alero, although a redesigned exhaust manifold requires some modification. Also required will be a wiring harness and powertrain control module. The engine develops up to 211 horsepower and 220 foot-pounds of torque. It originally powered the Buick Terraza, Chevy Uplander, Pontiac Montana, Saturn Relay, Chevy Malibu, Pontiac G6 and Buick Rendezvous.

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