Zachary added an endorsement to his auto policy for coverage on his high-performance engine. What type of endorsement is this?

The endorsement that Zachary added to his auto policy for coverage on his high-performance engine is indeed categorized as Damage to Your Auto (Customized Equipment). This type of endorsement is specifically designed to provide coverage for modifications or enhancements made to a vehicle, such as high-performance engines, custom wheels, or other specialized equipment that may not be covered under a standard auto policy.

Standard auto insurance policies generally have limitations regarding coverage for modifications. By adding this specific endorsement, Zachary ensures that any damage to or loss of the customized components of his vehicle is protected, which reflects the additional value and importance of such enhancements to him as an owner.

The other options do not address the specific needs for customized equipment or modifications. Comprehensive coverage typically protects against non-collision-related damages, such as theft or weather-related incidents, rather than purely customized enhancements. Mechanical Breakdown Insurance focuses on coverage for vehicle mechanical failures rather than custom modifications. Extended Liability Coverage provides additional liability limits but does not pertain specifically to the coverage of high-performance engines or customized parts.