How much Sea Foam can be added to a 450 Cummins crankcase? [SOLVED] Asked by Ray M. In Arkansas I have 44 quarts of oil in my ISX 450 Cummins. How much Sea Foam is needed? Personally, I’d prefer to over do it a little.
Hi Ray. You can add 1 to 1.5 ounces per quart of oil, so anywhere from 44 ounces to 66 ounces per interval.