1, different mass

(1) The quality of conventional engine oil is guaranteed.

(2) Black oil is a private gas station with cheap blended oil.

2, the price is different

(1) The price of regular oil is slightly higher than that of private oil.

(2) Black oil is slightly cheaper than ordinary oil.

3. Additives in gasoline have different flame resistance to gasoline.

(1) As state-owned institutions, Sinopec and PetroChina add many additives to gasoline in order to reduce automobile exhaust emissions. The more additives, the faster the combustion speed, the higher the relative fuel consumption and the higher the cost.

(2) Black oil is because the additives in the oil are not cheap, while the additives in private gas stations are few, and the combustion speed is slow, which is relatively resistant to burning and saves money.