I understand the oil exchange
an oil filter
To replace the air cleaner
I’ve never seen it before
I think this is a set
I’ve never seen them exchange
Is there a case where you only change the oil when you say you change the engine oil
image text translation
(1)To filter out impurities from the engine oil
(2)Replace the oil filter
(3)Air cleaner
(4)Air conditioner filter no!
(5)To purify the air entering the engine
(6)Replace the air cleaner