What is the difference between non-standard oil and national standard oil?
4 Answers
The differences between non-standard oil and national standard oil are as follows: Density: The density range of national standard diesel is 0.810～0.855, varying with different models. Non-standard diesel certainly cannot meet such standards. Compared with regular diesel, apart from not meeting the standards, there is also the issue of price. Since it is non-standard, the price is significantly lower, and the combustion state is also different. Non-standard oil refers to blended oil that is not produced by regular refineries and fails to meet the national standards for clean gasoline and diesel. Its sources mainly include some individual gas stations that directly blend it with chemical raw materials such as naphtha, aromatics, and MTBE. Hazards: Non-standard diesel causes knocking in diesel vehicles, leading to severe mechanical wear, as well as difficulties in cold starts, increased fuel consumption, and black smoke emissions. It also generates deposits and gum, clogging car filters, forming a large amount of carbon deposits in the combustion chamber, causing piston sticking and increased wear.
The biggest difference between non-standard gasoline and national standard gasoline lies in quality. National standard gasoline is strictly produced according to state regulations, meeting all hard indicators like octane number and sulfur content. Non-standard gasoline is either secretly blended with additives by small refineries to make do, or mixed with inferior additives in smuggled oil. I've seen many car owners who opted for cheaper non-standard gasoline end up with engine knocking after just a few fills, and when opened up, the valve carbon deposits look like coal slag. The key issue is that such gasoline has poor anti-knock properties, which is practically a death sentence for turbocharged cars. When buying gasoline at gas stations, pay attention to whether the invoice comes with a quality inspection report—stations directly operated by the two major state-owned oil companies are generally reliable.
Simply put, it's the difference between the regular army and the ragtag forces. Standard-compliant fuels must pass a full set of quality inspections, with clear records on elements like sulfur content and gum presence in gasoline. Non-compliant fuels often mix aromatics with light oils to fake as 92-octane, resulting in poor performance and eventually clogging the catalytic converter. Last time, my neighbor's van had its engine warning light lit up like a Christmas tree after filling up at a shady fuel station—the mechanic found all oxygen sensors poisoned. Always choose fuels with the 'China VI-B' label for your car, and walk away if you see rusted storage tanks at the gas station.
It mainly lies in the production process and supervision. Standard national gasoline from regular refineries undergoes complete desulfurization and degumming, comparable to fresh mineral water. Non-standard gasoline is often residual oil from heavy oil catalytic cracking, mixed with methanol, resembling gutter oil with excessive impurities. Long-term use of such fuel may cause minor issues like injector gumming, but the real danger lies in fuel line corrosion and leaks. A long-haul driver I know insists on filling up only at Sinopec stations with the shield logo, and if the pump nozzle lacks a seal, he immediately switches stations.
