How long do Subaru drive belts last?

Serpentine (drive) belts in most Subarus typically last about 60,000 to 100,000 miles (roughly 5–7 years), while timing belts—where the engine still uses one—are usually replaced around 90,000 to 105,000 miles or 7–10 years, depending on the model and service history. Always check the owner’s manual or your dealership’s maintenance schedule for the exact interval that applies to your vehicle. This article explains typical lifespans, factors that can shorten them, and how to approach replacement for Subaru models.

The question matters because drive belts power essential components such as the alternator, power steering, and air conditioning. In many Subarus, the timing belt orchestrates valve timing and, if it fails, can cause severe engine damage in interference engines. Knowing the expected life span helps owners plan preventive maintenance and avoid unexpected breakdowns.

Serpentine drive belts: lifespan and maintenance

What the belt does

Before the list: The following points summarize how long Subaru serpentine belts typically last, when they should be inspected or replaced, and the factors that influence their life.

• Typical lifespan: 60,000–100,000 miles (about 5–7 years) under normal driving conditions.


• Replacement window: Many Subaru service schedules call for inspection around 60,000 miles and replacement around 90,000–100,000 miles, depending on model and environment.


• Wear indicators: Cracking, fraying, splitting, glazing, missing ribs, or squealing noises signal impending failure.


• Maintenance basics: Have the belt inspected along with the tensioner and idler pulleys; replace the belt and tensioner together if service is due.


• Environmental and usage factors: Frequent short trips, high heat, dusty roads, oil leaks, and belt misalignment can shorten belt life.

In practice, many owners replace the serpentine belt around the 90,000–100,000 mile mark or sooner if wear signs appear.

Timing belts: lifespan and maintenance

What it does and why it matters

Before the list: The following items cover timing belt service intervals, model-year variations, and the consequences of failure.

• Typical replacement interval: 90,000–105,000 miles or 7–10 years, whichever comes first, for many Subaru engines that still use a belt.


• Model-year variation: Some Subaru models used timing belts earlier and newer designs may use timing chains; check the owner's manual or service schedule for your engine.


• Failure risks: A broken timing belt can cause severe engine damage in interference engines, leading to expensive repairs.


• Water pump and other components: Replacing the timing belt often includes new water pump, tensioners, and idler pulleys to reduce the chance of future failures.


• Signs of wear: Cracking, fraying, missing teeth, oil contamination, or loss of tension indicate a belt should be replaced promptly.

If your Subaru still uses a timing belt, plan for replacement within the manufacturer’s recommended interval to avoid potential engine damage.

What affects belt life in Subaru models

Factors that shorten or extend belt life

Before the list: A look at the conditions and maintenance habits that influence belt longevity across Subaru’s lineup.

• Driving conditions: Frequent short trips, heavy city traffic, hot climates, and harsh road conditions can wear belts faster.


• Maintenance history: Delayed belt changes or skipped inspections increase the risk of unexpected failure.


• Contamination: Oil or coolant leaks that reach the belt degrade material and shorten life.


• Mechanical wear: Worn tensioners or misaligned pulleys accelerate belt wear and can cause squeals or slippage.


• Engine design and age: Some models use belts, others use chains; different designs have different replacement intervals and failure modes.

Bottom line: Regular inspections during service visits and adherence to the official maintenance schedule are essential for predicting belt life and timing replacements.

Practical guidance for Subaru owners

If you’re unsure about your model-year, consult the owner’s manual or contact a Subaru dealer or qualified shop. They can confirm whether your engine uses a timing belt or belt-driven accessories and provide a precise maintenance timeline. When in doubt, scheduling preventive replacement at the recommended interval is a prudent move to avoid roadside failures and costly damage.

Summary

In general, Subaru serpentine drive belts last about 60,000–100,000 miles (roughly 5–7 years), while timing belts—where applicable—are typically replaced around 90,000–105,000 miles or 7–10 years. Real-world wear depends on driving conditions, maintenance, and whether belts encounter oil leaks or excessive heat. Always follow the official maintenance schedule for your specific model, and consider replacing belts together with tensioners and other related components when service is due to prevent unexpected failures and protect the engine.

When to replace a Subaru drive belt?

Generally, this replacement interval is between 50,000 and 100,000 miles.

What is the life expectancy of a drive belt?

Drive belts typically last between 60,000 and 100,000 miles or about 3 to 5 years, though this can vary based on driving habits and climate. Regular inspections are key, and you should be prepared to replace the belt if you hear squealing, notice cracks, or experience issues with your car's power steering or air conditioning. 
Factors that affect lifespan

• Driving habits: Aggressive driving and frequent stop-and-go traffic can shorten a belt's life. 
• Climate: Extreme heat, cold, or moisture can accelerate wear. 
• Vehicle type: Newer vehicles may use more durable materials that extend belt life. 
• Type of belt: V-belts may need inspection sooner than serpentine belts (e.g., after 3 years or 30,000-40,000 miles). 

Signs of a failing drive belt

• Squealing, squeaking, or chirping sounds from the engine
• Cracks, fraying, or missing chunks on the belt's surface
• Power steering becomes sluggish or stops working
• Air conditioning stops working properly
• Engine overheating
• Battery isn't charging properly 

What are the signs of a failing drive belt?

Symptoms of a bad drive belt include squealing or flapping noises, difficulty steering, a non-working air conditioner, engine overheating, and warning lights on the dashboard. Visually inspecting the belt for cracks, fraying, glazing, or missing chunks is also a key way to identify a problem.
 
Audible symptoms 

• Squealing or chirping: A loud, high-pitched noise, especially at startup or when turning, indicates the belt is slipping on the pulleys. 
• Whining: A whining sound that changes with engine speed can be a sign of bearing issues in the pulleys caused by a belt that is too tight. 
• Flapping or grinding: A flapping sound from the engine bay can mean the belt is loose or damaged. 

Performance and warning light symptoms

• Difficulty steering: Since the drive belt powers the power steering pump, a bad belt will make steering much harder. 
• Air conditioning failure: The AC compressor is powered by the drive belt, so it will stop working if the belt fails. 
• Engine overheating: A failing belt can prevent the water pump from circulating coolant, leading to overheating. 
• Dimming or flickering lights: The alternator's power can be affected, causing dashboard lights, headlights, or interior lights to flicker or dim. 
• Dashboard warning lights: The battery warning light or the "check engine" light may turn on. 
• Poor performance: You might notice a general loss of power or engine misfiring. 

Visual symptoms

• Cracks or fraying: Look for cracks, splits, or frayed edges on the belt. 
• Glazing: The surface of the belt can become shiny and smooth from slipping, a condition called glazing. 
• Missing chunks: Missing pieces or worn ribs on the belt are a clear sign of damage. 
• Hardened rubber: The belt may feel stiff instead of pliable, making it more likely to break. 

How often should a Subaru timing belt be changed?

The Subaru timing belt interval is generally 105,000 miles or seven years, whichever comes first, although some older models or specific conditions may have different recommendations. It is crucial to follow the recommended replacement schedule to avoid catastrophic engine damage, which can occur if the belt breaks. Some mechanics recommend a more frequent interval, such as every 60,000 miles, especially with aftermarket parts or in harsh driving conditions. 
This video explains the difference between timing belts and timing chains in Subaru engines: 51sMrSubaru1387YouTube · May 18, 2025

• Standard interval: Replace the timing belt at 105,000 miles or seven years, whichever occurs first. 
• Older models: Vehicles prior to 1993 and 1993-1997 models (except in California) had a 60,000-mile interval. 
• California models: 1993-1997 Subaru models in California had an inspection every 30,000 miles and a replacement at 105,000 miles. 
• Model year 1999 and later: The interval is 105,000 miles or 105 months, with inspections recommended every 30,000 miles or 30 months. 
• Harsh conditions: Consider replacing the belt sooner than the recommended interval if you frequently drive in extreme weather, make many short trips, or have high mileage. 
• Risk of failure: A broken timing belt can cause severe and expensive engine damage, making it a critical maintenance item.