Adding Sea Foam to Hyundai Elantra oil and fuel [SOLVED] Asked by Patel K. In Manitoba, Can I add Sea Foam in oil tank and gas tank on same time? My car is a 2011 Hyundai Elantra GLS.
Thanks for the question, Patel. Yes, you can add Sea Foam to the fuel tank and oil at the same time. You can also add to either/or at any time, so always up to you!