All Lexus coupes, which are high performance cars, require high octane premium gas. The engines of these cars run with a high compression ratio to generate more power. The higher the octane level of the fuel, the less severe the knock or pinging noise will be when the air-fuel mixture detonates prematurely in the engine. The Lexus IS250 is a high performance car that falls into this category. The vehicle’s 2.5 liter V6 engine requires premium unleaded gasoline with an octane rating of 91 or higher.
Why does Lexus require premium fuel?
The reason that high-performance cars like the Lexus IS250 need premium gasoline is because of the higher compression ratio of their engines. The air-fuel mixture in these engines detonates prematurely more often than in standard engines, and the higher octane rating of premium fuel helps to prevent this from happening. When the air-fuel mixture detonates, the knock or pinging noise that you hear is an indication that this has occurred. The damage done to the engine due to knock can range from a loss of performance to catastrophic failure in some cases. By providing your Lexus with premium gasoline, you are ensuring top performance and durability for your engine.
Why does Lexus IS250 owners not use regular gasoline?
Lexus IS250 owners don’t use regular gasoline because the car’s engine is high performance. The 2.5 liter V6 engine in the Lexus IS250 has a higher compression ratio than most standard engines, and it requires premium unleaded gasoline with an octane rating of 91 or higher to run properly. Without using premium fuel, you may experience a loss of performance or even catastrophic engine failure. So, if you’re an owner of a Lexus IS250, be sure to always use premium gasoline in your car for the best results.

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