In first case, diesel and gasoline are swapped
If a petrol car is mistakenly added to a diesel car, car will vibrate, black smoke will come out of exhaust pipe, and ignition won't even start. With forced driving, entire oil circuit system will be damaged, and the engine may even be scrapped.
Solution: You should go to a 4S workshop to clean fuel tank and oil circuit system as soon as possible, and then carry out a comprehensive check of engine. Do not ignite, so as not to damage car.
When a diesel car is added to an unsuitable gasoline car, car can be driven at first, but after some driving, idle speed becomes clearly unstable, engine makes abnormal noise, and exhaust pipe starts spewing white smoke. Compared to gasoline vehicles with unsuitable diesel fuel, if situation is detected early, fuel can be replaced immediately and engine can still be run.
Solution: Find nearest 4S store and change gasoline immediately, it is best to take care of fuel tank and oil circuit system, and change fuel filter.
Second case: pour high-quality oil into low-quality cars
It is something that is often said that if you are used to eating coarse grains and eat small grains from time to time, effect will still be quite good. Since octane number of high-grade gasoline (97#) is higher than that of low-grade gasoline (93#), combustion is more complete and complete, and vehicle's power will also be higher.
In third case, pour low-grade oil into a full-fledged car
If second situation is reversed, then high-grade gasoline (97#) is added to low-grade gasoline (93#), and car may have insufficient power and increased fuel consumption. It is not recommended to use it for a long time because it is harmful to some engine damage. If difference between grades is too great, for example, a 97 brand car was mistakenly filled with 90 brand fuel, owner should drain low-grade gasoline before starting car, and it is best to go to a car service. 4S magazine for cleaning fuel tank and oil circuit system.
It may also be case that when filling up in convenient places, with only low-grade fuel, we can use fuel additives to improve quality of oil. PS: Long-term use is not recommended, since fuel additives, although they help to improve quality of oil, cannot remove carbon deposits.