Tech Spec: 2015 Chevrolet Impala

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The Chevrolet Impala was completely redesigned in 2014, and the 2015 Impala builds on that redesigned model. The 2015 Impala carries on last year’s new exterior aesthetic and builds on the dual-cockpit interior. 

A pair of new features enhances everyday driving: fuel-saving stop/start technology on the 2.5L engine and new OnStar with 4G LTE connectivity and standard built-in Wi-Fi hotspot. The stop/start technology shuts down the engine in certain driving conditions to reduce fuel consumption — boosting Impala’s city mileage 5 percent, to an EPA-estimated 22 mpg.

Impala offers two powerful and efficient powertrain offerings: the standard 2.5L intake valve lift control (iVLC) with stop/start technology and a 3.6L naturally aspirated V6.

There are no buttons to push or procedures to learn with Impala’s stop/start system. It automatically shuts down the engine when the car comes to a stop under certain driving conditions, such as at a stoplight. The engine automatically restarts when the driver takes his or her foot off the brake. The system monitors vehicle speed, climate control system operation and other factors to determine whether it is efficient to shut off the engine. Unique components used with stop/start include a tandem-solenoid starter that enables the engine to restart more quickly and more smoothly — even if the engine hasn’t come to a complete stop; an electrically-driven transmission auxiliary hydraulic pressure pump that keeps the fluid in the six-speed automatic circulation and primed for immediate take-off when the driver removes his or her foot from the brake pedal; and a larger, 12-volt AGM primary battery — which delivers up to four times to typical life cycle of a conventional battery — and a small, auxiliary 12-volt AGM battery. Other stop/start components include a dual-battery isolation module that ensures both batteries are properly charged and the primary battery always has a sufficient charge to start the vehicle and torque-reaction engine mounts that dampened the vibrations associated with a restart, helping deliver smooth performance.

The 2.5L engine is SAE-certified at 196 horsepower (146 kW) and 186 pound-feet of torque (252 Nm). Revised transmission shift points and quicker shifts also enhance the feeling of performance.

Output for the 3.6L V6 is rated at 305 horsepower (227 kW) and 264 pound-feet of torque (358 Nm). Lightweight features support a more balanced driving experience and include an integrated cylinder head/exhaust manifold design that saves approximately 13 pounds (6 kg) per engine.

The powertrains are the force behind the Impala’s driving experience, which is tuned for comfortable performance and rooted in a robust body structure. A MacPherson-strut front suspension delivers a greater measure of control with rebound springs that are internal to the struts. An isolated front cradle for the engine and transmission, as well as a hydraulic ride bushing, helps deliver a smoother, quieter ride. All models feature an electric variable-assist steering system that helps save fuel by drawing energy only when the steering wheel is turned.

The 2015 Impala is available in five different trim levels: LS, 1LT, 2LT, 1LTZ and 2LTZ. The base model LS features a starting MSRP of $27,060. A fully-loaded 2LTZ, complete with leather-appointed seats, 20-inch wheels, the comfort and convenience package, premium audio package, navigation, sunroof and full-speed-range adaptive cruise control, carries a pricetag of about $42,085.

Servicing the Impala

Because of the way people use vehicles, maintenance needs vary. Some vehicles may require more frequent checks and services. The Additional Required Services – Normal are for vehicles that carry passengers and cargo within recommended limits on the Tire and Loading Information label, are driven on reasonable road surfaces within legal driving limits and use the recommended fuel. The Additional Required Services – Severe are for vehicles that are mainly driven in heavy city traffic in hot weather, mainly driven in hilly or mountainous terrain, frequently towing a trailer, used for high-speed or competitive driving, or used for taxi, police or delivery service.

When the “Change Engine Oil Soon” message displays, drivers should have the engine oil and filter changed within 600 miles (1,000 km). If driven under the best conditions, the engine oil life system may not indicate the need for vehicle service for up to a year. The engine oil and filter must be changed at least once a year, and the oil life system must be reset.

Every 7,500 miles (12,000 km):

• Rotate the tires

• Check engine oil level and oil life percentage; if needed, change engine oil and filter, and reset oil life system

• Check engine coolant level

• Check windshield washer fluid level

• Visually inspect windshield wiper blades for wear, cracking or contamination; replace worn or damaged wiper blades

• Check tire inflation pressures

• Inspect tire wear

• Visually check for fluid leaks

• Inspect engine air cleaner filter

• Inspect brake system

• Visually inspect steering, suspension and chassis components for damaged, loose or missing parts or signs of wear

• Check restraint system components

• Visually inspect fuel system for damage or leaks

• Visually inspect exhaust system and nearby heat shields for loose or damaged parts

• Lubricate body components

• Check starter switch

• Check automatic transmission shift lock control function

• Check ignition transmission lock

• Check parking brake and automatic transmission park mechanism

• Check accelerator pedal for damage, high effort or binding; replace, if needed

• Visually inspect gas strut for signs of wear, cracks or other damage; check the hold-open ability of the strut

• Inspect sunroof track and seal, if equipped

Additional Required Services – Normal

Every 22,500 miles (36,000 km) or every two years:

• Replace passenger compartment air filter. More frequent replacement may be needed if the vehicle is driven in areas with heavy traffic, areas with poor air quality or areas with high dust levels. Replacement may also be needed if there is a reduction in airflow, excessive window fogging or odors.

Every 37,500 miles (48,000 km):

• Inspect evaporative control system

Every 37,500 miles (48,000 km) or three years:

• Replace brake fluid

Every 37,500 miles (48,000 km) or every four years:

• Replace engine air cleaner filter

Every 97,500 miles (156,000 km):

• Replace spark plugs

• Inspect spark plug wires

Every 150,000 miles (240,000 km) or every five years:

• Drain and fill engine cooling system

Every 150,000 miles (240,000 km) or every 10 years:

• Visually inspect accessory drive belts for fraying excessive cracking or damage; replace, if needed

Additional Required Services – Severe

Every 22,500 miles (36,000 km) or every two years:

• Replace passenger compartment air filter. More frequent replacement may be needed if the vehicle is driven in areas with heavy traffic, areas with poor air quality or areas with high dust levels. Replacement may also be needed if there is a reduction in airflow, excessive window fogging or odors.

Every 45,000 miles (72,000 km):

• Inspect evaporative control system

• Change automatic transmission fluid

Every 45,000 miles (72,000 km) or three years:

• Replace brake fluid

Every 45,000 miles (72,000 km) or four years:

• Replace engine air cleaner filter

Every 97,500 miles (156,000 km):

• Replace spark plugs

• Inspect spark plug wires

Every 150,000 miles (240,000 km) or every five years:

• Drain and fill engine cooling system

Every 150,000 miles (240,000 km) or every 10 years:

• Visually inspect accessory drive belts for fraying, excessive cracking or damage; replace, if needed

Fluids and Capacities

Engine Oil: dexos1; capacity 6.0 quarts (5.7 liters)

Coolant: Dex-Cool; capacity 9.1 quarts (8.7 liters)

Brake Fluid: DOT 3 Hydraulic Brake Fluid

Power Steering Fluid: GM Power Steering Fluid

Passenger Compartment Air Filter: ACDelco Part No. CF132

Spark Plugs: ACDelco Part No. 41-109

Wiper Blades: 21.7 in. (55.0 cm) driver and passenger side

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