What gas does a 2015 Lexus GS 350 take?
The 2015 Lexus GS 350 requires premium unleaded gasoline with a high-octane rating. In most markets, aim for 91 octane (AKI) or higher, with 93 octane often ideal for peak performance. Regular 87 octane can be used in a pinch, but you will lose power and efficiency over time.
Recommended fuel type and octane guidance
Understanding what fuels the GS 350 best helps you avoid knocking and enjoy optimal performance. The engine is tuned for high-octane petrol, and following the octane guidance in the owner’s manual will keep the engine running smoothly.
Before listing the practical details, here are the key points to keep in mind:
- Gasoline type: Premium unleaded gasoline is recommended for the GS 350 to support peak performance and smooth operation.
- Octane requirements: A minimum of around 91 AKI is generally advised; many drivers find 93 AKI fuels deliver the best overall performance.
- Ethanol content: Gasoline containing up to 10% ethanol (E10) is typically acceptable; check the manual for your region’s limits on ethanol content.
- Fuel quality: Use reputable brands and avoid questionable blends or fuels that don’t meet the vehicle’s octane and ethanol specifications.
In all cases, follow the owner’s manual for the precise octane specification and ethanol limits to ensure optimum performance and longevity of your engine.
Regional considerations
United States and Canada
In North America, premium unleaded gasoline with a higher octane rating is recommended (typically 91 AKI minimum; many premium fuels are 93 AKI). Regular 87 octane is not recommended for normal operation, as it can reduce performance and responsiveness. Always verify the octane guidance and ethanol content in your local manual, since formulations can vary slightly by region.
Europe, the Middle East, Africa, and Asia-Pacific
Outside North America, the GS 350 remains a premium-powered vehicle. Use premium gasoline with the octane rating appropriate for your region and aligned with the car’s requirements (often equivalent to or higher than 91 AKI, adjusted to local rating systems such as RON). When in doubt, follow the local owner’s manual to ensure you meet the high-octane standard the engine expects.
What happens if you use lower-octane fuel?
Using fuel with an octane rating below the recommended level can cause knocking or pinging under load, reduced acceleration, and lower fuel economy. Prolonged use of low-octane fuel may place additional stress on the engine and exhaust systems. If you accidentally fill with regular gas, you can still drive until you can refuel with premium, but plan to refuel with the proper octane at the next opportunity.
Summary
The 2015 Lexus GS 350 is designed to run on premium unleaded gasoline with a high-octane rating. In most regions, target 91 AKI or higher, with 93 AKI commonly providing the best balance of performance and efficiency. Regular 87 octane is not recommended for normal operation, though it may be tolerable in an emergency. Always follow your local owner’s manual for the exact octane and ethanol content guidelines.
Does Lexus take 91 or 93 gas?
With that said, you're probably asking yourself, “Does Lexus require premium gas?” For most (but not all) of the Lexus lineup, the answer to that question is yes. Most Lexus models require you use at least 91 octane (premium) gasoline, while there are a few that can use 87 octane regular unleaded.
What happens if you accidentally put 87 instead of 91 in a Lexus?
If you accidentally put 87 octane instead of 91 in a Lexus, your car will likely experience a loss of power and performance, and you may hear engine knocking or pinging. Modern Lexus models have knock sensors that adjust the engine's timing to prevent damage from lower octane fuel, but this reduces power. While a single tank is unlikely to cause serious damage, it's best to avoid heavy acceleration and fill up with the correct 91+ octane fuel as soon as possible to dilute the lower-octane gas.
What to expect
- Reduced performance: The engine may feel sluggish, with slower acceleration and reduced power output.
- Engine knocking or pinging: This is a rattling or pinging sound that occurs when the fuel detonates prematurely, especially under acceleration or when going uphill.
- Lower fuel efficiency: You may visit the gas station more frequently, which could negate any short-term savings on fuel.
- Potential for damage (older vehicles): Older Lexus models may not have the same sophisticated knock sensors. Repeatedly using 87 octane in a car that requires 91 can lead to engine damage over time.
What to do
- Avoid heavy acceleration: Drive gently to prevent the engine from knocking.
- Fill up with premium fuel: When your tank is low, fill it with the correct 91+ octane gas. This will dilute the remaining 87 octane fuel.
- Monitor your engine: Pay attention to any persistent knocking or changes in performance.
- Consult your owner's manual: Check the manual for the specific octane requirement of your Lexus model.
- Seek professional help if needed: If the knocking continues after filling up with premium gas, have a mechanic check the knock sensors and ignition timing.
What kind of gas does a 2015 Lexus GS350 take?
The 2015 Lexus GS350 Sport requires high-octane premium gasoline to prevent engine knocking caused by premature combustion. Using regular gas can lead to reduced power, lower fuel efficiency, and potential long-term engine damage. If you experience knocking, switch back to premium fuel immediately.
Does a Lexus 350 need premium gas?
Whether a Lexus 350 requires premium gas depends on the model year. Older models (typically pre-2023) generally use regular 87-octane gas, while newer models, particularly the RX 350 and IS 350, are designed for premium 91-octane fuel. Always check your owner's manual or the gas cap for the specific fuel recommendation for your vehicle.
- For models 2023 and newer: Many new models, like the RX 350, require premium gas (91 octane or higher) for optimal performance.
- For models 2022 and older: Many models, such as the RX 350 and ES 350, use regular unleaded gas (87 octane).
- For IS models: Both newer and older IS 350 models typically require premium 91-octane unleaded gas.
Important Considerations:
- Owner's Manual: The most accurate information is in your car's owner's manual or on the inside of the fuel filler door.
- Performance: Using premium gas in a newer model is necessary to achieve its advertised horsepower and may be required to avoid voiding your warranty.
- Engine Damage: Using lower-octane gas in a vehicle that requires premium can cause engine knocking and may lead to long-term engine damage.
- Flexibility: Some models are designed to run on regular fuel, but performance may be reduced. In these cases, using premium fuel won't harm the engine and might provide a slight performance benefit.
