Cars in this mod get dirty over time

This is a fancy system I made for my mod.
It basically keeps track of a mud score for a vehicle and based on it, it makes dirt appear.

Technical stuff ahead!!!
If you drive on dirt, grass or clay with a speed greater than 5ms, it starts adding to that score every tick.
Time elapsed decreses this score slowly down to 50% min, being in water decreaes it, rain decreases it.
However, driving fast in the rain, that doubles the rate, in a thunderstorm it triples it, unless youre standing still, then the rain washes off the dirt quicker due to more downpour.

Im proud of this system so I wanted to share <3