No matter the condition of your 2015 CTS, OPGI has the Oils, Fluids & Sealer products you need to boost performance and get you back on the road. We currently carry 24 Oils, Fluids & Sealer items to choose from for your 2015 CTS, and our Price Match Guaranteed prices range from as little as $2.18 up to $109.99. OPGI offers POR-15 plus six other trusted brands of Oils, Fluids & Sealer products for your 2015 CTS, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Oils, Fluids & Sealer items in person.