718 with 95 or 98?
1 Answers
The Porsche 718 uses 95-octane gasoline, as announced by the automaker. Owners of the Porsche 718 can also check this information in the vehicle's configuration sheet. Generally, the higher the gasoline octane rating, the higher the octane number and the better the anti-knock performance. 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane. High-compression engines should use high-octane gasoline. Using low-octane gasoline in a high-compression engine can lead to abnormal combustion, causing knocking, increased fuel consumption, and reduced power. For the Porsche 718, in addition to checking the recommended gasoline octane in the owner's manual, you can also find it on the fuel tank cap, which will indicate the appropriate octane rating. Typically, the required gasoline octane can also be determined by the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92-octane gasoline, those between 10.0-11.5 should use 95-octane gasoline, and those with higher compression ratios should use 98-octane gasoline. However, with the use of new technologies, the compression ratio alone cannot determine the required gasoline octane. High-compression engines can be tuned to use lower-octane gasoline because factors other than compression ratio, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Occasionally using the wrong gasoline octane is not a problem as long as you switch back to the correct one afterward. However, prolonged use of the wrong octane can have the following effects: For vehicles designed for low-octane gasoline, using high-octane gasoline will not cause damage, but the increased octane rating can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for high-octane gasoline, using low-octane gasoline can cause engine knocking. Since the octane rating is too low, the gasoline may ignite prematurely during the compression stroke before the spark plug fires. This creates resistance during the upward stroke, making the engine run very unstable. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues. The vibrations not only affect driving stability but can also cause abnormal wear on the pistons and cylinders, potentially leading to severe engine damage.
