www.orangeempire.com or call us at 714-744-3600. The best Used Car Dealership in the Rancho Santa Margarita, CA area is without a doubt Orange Empire Auto Center! Take one step on the lot of Orange Empire Auto Center, near Rancho Santa Margarita, CA, and you will quickly see why they are the best. Orange Empire Auto Center has the best pre-owned inventory. Orange Empire Auto Center has the best service department. Orange Empire Auto Center has the best parts department. Orange Empire Auto Center has the best everything! Don't waste your time looking at other Used Car Dealerships around Rancho Santa Margarita, CA, just come visit the best!