The five oils, four filters, and three waters are:
Five oils refer to engine oil, steering assist oil, gasoline, transmission oil, and brake oil.
Four filters refer to engine oil filter, gasoline filter, air filter, and air conditioning filter.
Three types of water refer to glass water, cooling water, and battery water.

Oil can also play a role in protecting and cooling the engine, and it also exists as a sealing agent and rust inhibitor. The acidic substances produced by car power combustion have strong corrosiveness, and this effect of oil provides good protection for the engine.
be careful
Generally, oil filter, fuel filter, air filter and air conditioning filter are collectively referred to as "four filters". They all serve as filters, but the replacement cycle is slightly different:
The replacement cycle of oil filter is generally 5000km.
The replacement cycle of fuel filter is generally 10000 km.
The replacement cycle of the air filter is generally 10000 kilometers.
The replacement cycle of the air conditioning filter is generally 20000 kilometers.