Subaru Ascent 2018-2026 Owner's Manual: New vehicle break-in driving - the first 1,000 miles (1,600 km)

The long-term durability, efficiency, and overall performance of your Subaru Ascent depend greatly on how carefully the vehicle is treated during its initial driving period. Proper break-in practices help ensure that key engine and drivetrain components settle correctly and operate at their best over time.

During the first 1,000 miles (1,600 km) of driving your Subaru Ascent, it is essential to follow these guidelines to promote optimal engine conditioning and longevity.

• Avoid high engine speeds and never allow the engine to exceed 4,000 rpm unless absolutely necessary in emergency situations.
• Do not maintain a constant speed for extended periods. Varying engine load and vehicle speed helps components break in more evenly.
• Refrain from sudden starts and aggressive acceleration whenever possible.
• Minimize hard braking except when required for safety.

These same precautions should also be observed in the Subaru Ascent when installing a rebuilt engine, replacing the engine, or fitting new brake pads, as these components also require a proper break-in period to function correctly.

Fuel economy hints

To maximize fuel efficiency in your Subaru Ascent, consider adopting the following driving habits and maintenance practices.

• Select the appropriate gear according to road conditions and driving speed to ensure efficient engine operation.
• Avoid abrupt acceleration or braking.

  Gradually increase speed and maintain a steady pace whenever possible to improve fuel consumption.

• Do not repeatedly press the accelerator pedal or rev the engine unnecessarily.
• Reduce idle time to a minimum, especially when the vehicle is stationary.
• Ensure that your Subaru Ascent engine is regularly serviced and properly tuned.
• Maintain correct tire pressure as specified on the tire inflation label located on the driver's side door frame. Underinflated tires increase rolling resistance and fuel usage.
• Use the air conditioning system only when needed, as it places additional load on the engine.
• Keep wheel alignment properly adjusted to reduce drag and uneven tire wear.
• Avoid carrying unnecessary cargo, as extra weight reduces fuel efficiency.