As your Authorized AMSOIL Dealer in Oceanside, Synthetic Oil Inc. is dedicated to providing North County’s premier coastal gateway with the world’s best synthetic lubricants. Synthetic Oil has proudly served the entire San Diego metropolitan area for over 30 years. From the salt-heavy air near the Oceanside Pier to the high-mileage commutes passing Camp Pendleton, our AMSOIL motor oils and filters are engineered to protect your engine against the unique environmental demands and heavy traffic of the I-5 and Highway 78. Beyond automotive care, we specialize in high-performance Marine, Motorcycle, and Off-Road lubricants, ensuring your boat, bike, or 4×4 is ready for the Pacific or the desert. Shop online for factory-direct shipping straight to your Oceanside doorstep.