What is the difference between using 95 and 98 octane gasoline in a Mercedes-Benz E300?

[DeLena]

The Mercedes-Benz E300 uses 95 octane gasoline, which is composed of isooctane and n-heptane. Higher octane numbers are not necessarily better; the appropriate gasoline grade should be selected based on the engine's compression ratio. Here is some relevant information: 1. Standard gasoline: Standard gasoline is composed of isooctane and n-heptane. Isooctane has good anti-knock properties, with an octane rating of 100, while n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, with an octane rating of 0. If the gasoline is labeled as 90 octane, it means that the gasoline has the same anti-knock properties as standard gasoline containing 90% isooctane and 10% n-heptane. 2. Compression ratio: The primary criterion for selecting gasoline grade is the engine's compression ratio, which is also a core energy-saving indicator in modern cars. Engine operation consists of a repetitive cycle of intake, compression, combustion, exhaust, and intake in the cylinders. The compression ratio is the ratio of the cylinder volume when the piston is at its farthest point to when it is at its nearest point in the stroke.