Which of the following is a benefit of the SK+ unlimited plan?

The SK+ unlimited plan offers a variety of features designed to enhance the car wash experience for its users. One of the significant benefits included in this plan is tire dressing. Tire dressing is an important service that not only improves the appearance of tires by giving them a shiny, polished look but also helps protect them from cracking and fading due to environmental factors. This feature adds value to the overall service, making it a key selling point for customers who are looking for comprehensive car care.

While other options may seem beneficial, they do not directly relate to the core offerings of the SK+ unlimited plan. For instance, discounts on detailing products, free car rentals, or guaranteed appointment times are not standard features associated with the SK+ unlimited plan, highlighting why tire dressing stands out as the correct answer in this context.