Maintenance of spark plugs for 8,000 kilometers
NelsonFox 
7 The 2021 model is 530LI. The car is relatively small, 8000 kilometers. Today, I will go for second insurance. The 4s said to change the oil, air filter, air conditioner filter, and fuel filter. I asked to do only the first two items, not the last two items, and add 5.25 liters of oil. Then I asked the master to help me take apart the spark plug and take a look.
Feeling:
1. The air filter is not dirty, and it should still be able to run 5000 kilometers. It doesn’t matter, it’s better to change the right car in advance.
2. The famous B48 engine has incomplete oil-gas separation and oil leakage problems in the spark plug. I asked the master to remove the spark plugs of cylinders 1 and 4. After a comparison, cylinder 1 must have a little penetration of oil and gas, but it was dry, not wet, and it felt okay.
Feeling:
1. The air filter is not dirty, and it should still be able to run 5000 kilometers. It doesn’t matter, it’s better to change the right car in advance.
2. The famous B48 engine has incomplete oil-gas separation and oil leakage problems in the spark plug. I asked the master to remove the spark plugs of cylinders 1 and 4. After a comparison, cylinder 1 must have a little penetration of oil and gas, but it was dry, not wet, and it felt okay.
Comparison of spark plugs for cylinders 1 and 4.
Comparison of spark plugs for cylinders 1 and 4.
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