Should the CT5 use 92 or 95 octane gasoline?

[StCorey]

The Cadillac CT5 should use 95 octane gasoline, as per official data. The CT5 is a midsize sedan under the Cadillac brand. In terms of body dimensions, the 2022 28T Premium, Platinum, Fashion, and Luxury (standard version) models measure 4924/1883/1445 mm in length, width, and height, respectively, with a wheelbase of 2947 mm. Power-wise, the Cadillac CT5 is equipped with a 2.0T variable-cylinder turbocharged engine, delivering a maximum power of 174 KW and a peak torque of 350 Nm, while also meeting the China VI emission standards. The transmission system is paired with a 10-speed automatic manual transmission. In addition to checking the appropriate gasoline grade in the vehicle's manual, you can also find it on the fuel tank cap, which will indicate the recommended grade. Generally, the gasoline grade can also be determined based on the engine's compression ratio. Cars with an engine compression ratio between 8.6-9.9 should use 92 octane gasoline, those between 10.0-11.5 should use 95 octane gasoline, and if the compression ratio is higher, 98 octane gasoline is recommended. However, with the use of new technologies, the compression ratio alone cannot determine the gasoline grade. High compression ratios can be adjusted to use lower-grade gasoline due to other influencing factors such as ignition timing, turbocharging technology, and Atkinson cycle technology. Using 95 octane gasoline significantly reduces engine vibration compared to 92 octane. 95 octane gasoline burns more completely, resulting in less carbon buildup in the engine and better vehicle performance due to more thorough combustion. Different octane ratings lead to different anti-knock performances. Gasoline is a mixture produced by adding a certain amount of anti-knock agents to the same base gasoline, resulting in gasoline with varying anti-knock properties. Different gasoline components, such as straight-run gasoline, catalytic cracking gasoline, and catalytic reforming gasoline obtained from petroleum refining, are refined and blended with high-octane components, primarily used as fuel for automotive spark-ignition internal combustion engines. If the Cadillac CT5 occasionally uses the wrong gasoline grade, simply switch back to the correct grade after use. However, prolonged use of the wrong gasoline grade can have the following effects: For vehicles designed for lower octane gasoline, using higher octane gasoline will not cause damage, but the increase in 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 higher octane gasoline, using lower octane gasoline can cause engine knocking. The significantly lower octane rating reduces the gasoline's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug ignites, resistance is created during the upward stroke. This resistance makes the engine run very unstably. If the knocking is mild, it only increases noise without significant engine damage. However, noticeable knocking indicates severe engine conditions, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, and in severe cases, cylinder scoring.