What have you learned? Check out the following 3 questions, multiple choice possible.
What indicates it is time to change the oil filter?
The oil pressure light comes on.
The engine makes weird noises.
There is no good indicator as you cannot look inside the filter.
How often should you change your cabin air filter?
At least once a year or every 15.000 km.
Every 2 years or 30.000 km.
Never, there is no need to change a cabin air filter.
Paper does not equal paper. What does MANN-FILTER usually do to reach the highest filter media quality?
Adding of synthetic fibre
Pleating, curing of the paper using heat
Use of activated carbon or nano fibres
Dying of the paper
Check my answers