Should the Old Crown Use 92 or 95 Octane Gasoline?
2 Answers
The maintenance manual and fuel tank cap of the Old Crown recommend using 95 or 97 octane unleaded gasoline. Do not blindly use higher or lower octane gasoline, as this may lead to increased carbon deposits. It is best to follow the manufacturer's recommended gasoline octane rating for optimal performance. Below is an introduction to 92 and 95 octane gasoline: 92 Octane Gasoline: 92 octane gasoline contains 92% isooctane and 8% n-heptane. 95 Octane Gasoline: 95 octane gasoline contains 95% isooctane and 5% n-heptane. When the engine's cylinders perform piston movements, gasoline and air mix and compress inside the cylinder. If the pressure is too high, knocking may occur.
The old Crown I'm driving now is a vintage car from the 1990s. The manual recommends using 92-octane gasoline, so that's what I usually fill up with. Older car engines have lower compression ratios and were designed for regular fuel, so there's not much need to use higher-octane 95-octane gas—it's more economical and hassle-free to stick with 92. The 92-octane offers better value for money, being over 1 yuan cheaper per liter. Filling up dozens of tanks a year can save you around a thousand yuan. Plus, using 95-octane might not improve fuel efficiency, and the engine could develop carbon buildup issues due to mismatch, leading to costly and time-consuming repairs. Of course, occasionally treating your car to 95-octane won't cause major problems, but sticking with 92 long-term is the safest bet. Just remember to choose reputable gas stations to ensure fuel quality—don't compromise on cheap, low-quality gas that could shorten your engine's lifespan.
