As your Authorized AMSOIL Dealer in National City, Synthetic Oil Inc. is dedicated to providing one of San Diego’s most historic automotive hubs with the world’s best synthetic lubricants. Synthetic Oil has proudly served the entire San Diego metropolitan area for over 30 years. From the stop-and-go traffic along the Mile of Cars to the heavy industrial and marine activity near the National City Marine Terminal, our AMSOIL motor oils and filters are engineered to protect your engine against the unique high-idling and heavy-load demands of the South Bay. Beyond automotive care, we specialize in high-performance Marine, Motorcycle, and Off-Road lubricants, ensuring your work truck, boat, or bike is ready for the Pacific or the job site. Shop online for factory-direct shipping straight to your National City doorstep.