Under the Hood: Assessing the Reliability of Used Subaru Engines

Subaru has built a reputation for crafting vehicles that offer exceptional performance and rugged durability, particularly through their signature Boxer engines. However, if you're in the market for a used Subaru, it’s crucial to understand the reliability of its engine to ensure you’re making a sound investment. Here, we delve into the factors influencing the reliability of used Subaru engines and what you should consider before making a purchase.

The Subaru Boxer Engine: An Overview

At the heart of many Subaru vehicles is the Boxer engine, renowned for its unique horizontal layout. This configuration offers a lower center of gravity, which enhances vehicle stability and handling. However, this engine design also comes with its own set of maintenance and reliability considerations.

Common Issues with Used Subaru Engines

Head Gasket Failures: One of the most common issues with Subaru engines, especially those produced before the 2010 model year, is head gasket failure. This problem often arises due to engine overheating or gasket degradation over time. While newer models have improved head gaskets, it’s wise to check the service history of any used Subaru to ensure this issue has been addressed.
Oil Consumption: Some Subaru engines, particularly those with a high mileage or older design, are known for excessive oil consumption. This can be due to worn piston rings or cylinder walls. Checking the oil levels and looking for signs of excessive smoke or leaks can help identify this problem before purchase.
Timing Belt Issues: Subarus equipped with timing belts (rather than timing chains) require regular maintenance. A neglected timing belt can lead to severe engine damage. Verify that the timing belt has been replaced according to the manufacturer’s recommended schedule.
Turbocharger Wear: For Subaru models with turbocharged engines, such as the WRX, the turbocharger can experience wear and tear. Listen for unusual noises or reduced power output, which may indicate turbocharger issues. Regular maintenance and oil changes are crucial for these engines.

Evaluating a Used Subaru Engine: Key Steps

Service History: Request a detailed service history from the seller. Regular oil changes, timely head gasket replacements, and adherence to the manufacturer’s maintenance schedule are good indicators of engine health.
Pre-Purchase Inspection: Always have a trusted mechanic perform a pre-purchase inspection. They can identify potential issues that might not be immediately apparent and provide a clearer picture of the engine’s condition.
Check for Recalls: Research any recalls related to the specific model and year of the Subaru you’re considering. Addressing recalls promptly can prevent future issues and ensure the vehicle is safe and reliable.
Test Drive: Pay attention to the engine’s performance during a test drive. Look for smooth acceleration, steady idling, and any unusual noises that could indicate underlying problems.