Fields visibility based on a dropdown number

Hi, what would be the best way to configure the following example:

Let's say the business is a car service company, where a customer (Account) can have 1 or more cars. The company needs to record the last date when the oil and tires were replaced and when each of them will need to be replaced depending on the number of cars in an Account.

I need is to create a 'number of cars' field and if the number 1 is chosen, then 4 field for oil and tires appear (last changed and next due for each component), but if the 'number of cars' field is 2, then 8 fields for oil and tires will appear.

I am not sure if I need to create these field as 'Dependent' fields or if it will be better to use a formula... or if this is possible at all.

I have attached a sketch of what I am trying to achieve.

Thank you in advance,