Where we store the concrete is coated. Concrete doesn't weather that well uncoated over time.
It is urethane type coating I believe. Kind of dark and not that pretty.
Tires don't touch concrete which can wick oils out of tires and hold moisture, that degrades tires over a long time too.
There are several durable as iron coatings available from Lowes and Home Depot etc. Water based or oil based. Ours at the houss is kind o a gray brown.
Even stored indoors concrete can wick oils out and hold moisture in. So coat it.