S.D. Codified Laws § 32-6B-61
The schedule of compensation for warranty work shall include reasonable compensation for diagnostic work, as well as repair service, parts, and labor. Time allowances for diagnosis and performance of warranty work and service shall be adequate for the work to be performed. The hourly labor rate paid to the dealer for warranty services may not be less than the rate charged by the dealer for like service to nonwarranty customers for nonwarranty service. Reimbursement for parts used in the performance of warranty repair may not be less than the current retail rate customarily charged by the vehicle dealer for such parts. Each manufacturer or component manufacturer, in establishing a schedule of compensation for warranty work, shall rely on the vehicle dealer's written schedule of hourly labor rates and parts and may not obligate any vehicle dealer to engage in unduly burdensome documentation thereof, including, without limitation, obligating vehicle dealers to engage in transaction by transaction calculations.
SDCL 32-6B-61