What kind of gas does a Toyota 4Runner take?

The Toyota 4Runner, a popular mid-size SUV, is designed to run on regular unleaded gasoline. Specifically, the 4Runner requires 87 octane fuel, which is the standard grade of gasoline found at most gas stations.

Fuel Requirements for the Toyota 4Runner

According to Toyota's official specifications, the 4Runner has the following fuel requirements:

• Fuel Type: Regular unleaded gasoline


• Octane Rating: 87 AKI (Anti-Knock Index) minimum


• Fuel Tank Capacity: 23 gallons (87 liters)

It's important to note that while the 4Runner can run on 87 octane fuel, Toyota does recommend using 88 octane or higher for optimal performance and fuel efficiency. Using a higher octane fuel than the minimum requirement can help prevent engine knocking and improve overall engine operation.

Reasons for Using Regular Unleaded Gasoline

There are a few key reasons why the Toyota 4Runner is designed to run on regular unleaded gasoline:

• Cost Savings: Regular unleaded gasoline is typically the most affordable fuel option, allowing 4Runner owners to save money on fuel costs.


• Availability: Regular unleaded gasoline is the most widely available fuel type, making it easy to find and refuel the 4Runner no matter where you are driving.


• Engine Design: The 4Runner's engine is engineered to operate efficiently on regular unleaded fuel, without requiring the higher octane ratings of premium gasoline.

As long as you use the recommended 87 octane (or higher) fuel, your Toyota 4Runner will perform as intended and provide reliable, efficient transportation.

Does the Toyota 4Runner need premium gas?

No, a Toyota 4Runner does not require premium gas; it is designed to run on regular 87-octane unleaded gasoline. While some owners report potential minor performance benefits or smoother operation with premium fuel, using it is not necessary and can be a waste of money, as the engine is tuned for regular fuel. 

• Official recommendation: Toyota officially recommends using regular 87-octane unleaded gasoline for all 4Runner models, including the new 2025 and hybrid versions. 
• Engine performance: The engine will perform as designed on 87 octane. Using premium fuel is not required to avoid damage and will not provide significant performance gains. 
• Potential minor benefits: Some users suggest that using higher-octane fuel may lead to slightly better fuel efficiency or performance, but this is not officially supported by Toyota and is often debated among owners. 
• Avoid lower octane: The only thing to avoid is fuel with an octane rating lower than 87, as this could lead to engine knocking and potential engine damage. 

Should I use 87 or 89 gas?

Your car will run just fine. All modern cars can run 87,89,91,93. It's suggested that for maximum power that you use 93. If you're not at a track day event and just daily commuting 87 will serve you well. All modern cars are equipped with knock sensors to prevent engine damage from running lower octane fuel.

Which year 4Runner to avoid?

You should avoid the 2003–2005 4Runners due to serious frame rust, head gasket issues, and dashboard cracking. Other years to consider avoiding are the 2001–2002 models for safety concerns and rust, and the 2015 model for infotainment and brake problems. 
2003–2005 (Fourth Generation) 

• Severe frame rust: This is a major issue, with many owners reporting the frame is irreparable. 
• Head gasket failure: V6 models, in particular, are prone to head gasket issues, which can be a costly repair. 
• Dashboard cracking: Owners have reported the dashboard cracking. 
• Other issues: Includes reports of faulty anti-lock brake systems (ABS), air injection pump failures, and check engine light problems. 

2001–2002 (Third Generation) 

• Safety rating: These models have low crash test scores, particularly in rear impacts. 
• Body rust: Prone to rust, making them unreliable for some families. 
• Off-road limitations: Manual transmission and locking rear differentials were eliminated during these years. 

2015 (Fifth Generation) 

• Infotainment issues: This model is known for an unreliable infotainment system that freezes, restarts, and has Bluetooth connection problems. 
• Brake problems: Owners have reported warped brake rotors. 
• Steering complaints: There are more NHTSA complaints about steering problems compared to other fifth-gen models. 
• Airbag defect: The 2015 is the only fifth-generation model with reported airbag non-deployment issues, which is a significant safety concern. 

What happens if I put 87 instead of 91?

If you put 87 octane instead of 91 in a car that requires it, your modern engine's computer will likely adjust timing to prevent damage, but you may experience reduced performance and fuel efficiency. For a one-time mistake, drive gently and fill up with 91 octane the next time to dilute the fuel. However, consistently using lower-octane fuel in a high-compression or performance engine can lead to engine knocking and potential damage. 
What to expect in the short term

• Reduced performance: You may notice less acceleration and overall power. 
• Engine knocking or pinging: This is a rattling noise that can occur when the fuel pre-ignites in the cylinder. 
• Decreased fuel economy: Your car may use more fuel to go the same distance. 

How to mitigate the effects

• Avoid hard acceleration: Drive gently, especially at high speeds or when climbing hills, to minimize the risk of engine knocking. 
• Fill up with 91 octane: When your fuel tank is low, fill it up with 91 octane to mix with the remaining 87 octane fuel. This will dilute the lower-octane fuel and raise the overall rating. 
• Check your owner's manual: The manual will specify if 91 octane is a requirement or simply a recommendation. 
• Be cautious with performance vehicles: Cars with turbochargers or high-compression engines are more susceptible to damage from lower-octane fuel, so it is especially important to avoid aggressive driving.