Should Roewe Use 92 or 95 Octane Gasoline?

[StLane]

Roewe vehicles should use 92 octane gasoline, as this fuel grade is recommended in the official vehicle user manual. In addition to checking the appropriate gasoline grade in the user manual, the fuel cap will also indicate the recommended grade. Generally, the gasoline grade can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95 octane gasoline. If the compression ratio is higher, 98 octane gasoline is recommended. However, with the application of new technologies, the compression ratio alone cannot determine the gasoline grade, as high-compression engines can also be tuned to use lower-octane gasoline. Other factors, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Generally, the higher the gasoline grade, 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. If you occasionally use the wrong gasoline grade in a Roewe, simply switch back to the correct grade after refueling. However, long-term use of the wrong gasoline grade can have the following effects: Using a higher octane gasoline in a vehicle designed for lower octane will not cause damage, but the increased octane 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. Using a lower octane gasoline in a vehicle designed for higher octane can cause engine knocking. The significantly lower octane reduces the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues, affecting driving stability and causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring.

[DiFaith]

I've been filling my Roewe i5 with 92 octane, as indicated on the fuel cap. Actually, the vehicle manual is the most accurate reference. For turbocharged models like the RX5, the manufacturer recommends using 95 octane. The gasoline grade is related to anti-knock performance, not quality—higher numbers don't mean premium. Using 95 octane reduces engine vibration and delivers crisper power response on highways, but it costs an extra 0.2 yuan per kilometer. If unsure, 92 octane won't harm the engine—just avoid cheap, low-quality fuel. Long-term use of incorrect grades may increase carbon deposits, potentially requiring throttle valve cleaning.

[DeclanMarie]

When I first got the Roewe RX8, I was also torn about the fuel choice. The salesperson said turbocharged cars perform better with 95 octane. I tried 92 and it worked fine, except the engine sound was a bit muffled when going uphill. Now I use 92 for city commuting and switch to 95 for long trips. I regularly use fuel additives to clean carbon deposits, and after six years and 80,000 kilometers, it's still running perfectly. The key is sticking to one gas station—don't mix 92 and 95 randomly.

[SanMila]

The choice of fuel for Roewe vehicles depends on the engine compression ratio. When I drove the older 550 model with a 1.8L naturally aspirated engine and a compression ratio of 10.5, 92-octane fuel was perfectly sufficient. Now, the new turbocharged models have compression ratios above 11, so it's recommended to use 95-octane for better stability. Some owners claim that 95-octane saves fuel, but my actual tests showed only a 0.3L difference per 100 kilometers. If the manual states '92-octane or above,' it means 92 is the minimum baseline. Those using 92-octane shouldn't fret over the small price difference—regular maintenance is far more important than the fuel grade.

[SanLola]

For fuel-related questions, the 4S shop is the most reliable source. During the last maintenance, the technician mentioned that for a 1.5T engine like the Roewe i6, long-term use of 92-octane fuel can easily trigger the malfunction indicator light. 95-octane gasoline has a higher octane rating, providing better protection for direct injection engines. If you occasionally fill up with 92-octane, don’t panic—just switch back to 95 next time. However, never follow some owners who mix different grades. Different octane levels have different additives, and mixing them may lead to clogged fuel injectors. The cleaning cost could then cover half a year’s worth of fuel.

[DeTessa]

Both 92 and 95 octane fuels can be used, but it depends on your driving habits. For me, driving in the city daily to pick up and drop off kids, 92 octane is perfectly sufficient. If you frequently drive on highways or enjoy accelerating aggressively from a standstill, 95 octane would be more suitable. For cars with 'Please use unleaded gasoline of 92 octane or above' marked on the fuel cap, using 95 octane is better for engine longevity. The worst scenario is trying to save money by using low-quality fuel from private gas stations. Last year, an RX5 in our neighborhood spent over 3,000 yuan replacing its fuel pump—that's what you call being penny-wise and pound-foolish.