How much Sea Foam should I pour in my oil tank? For a Cadillac Deville DHS 4.6l v8? [SOLVED]

Thanks for the question, Ian. Add 1 ounce of Sea Foam per quart of oil in the crankcase. (example: for a crankcase with a 7 quart capacity, add 7 ounces of Sea Foam). Do not exceed 1 ounce per quart of oil.

We recommend adding it 100-300 miles before your next oil change. That gives the Sea Foam enough time to circulate and clean, and it allows all the reliquefied oil residues to be drained away with the old oil.

Let me know if you have any questions, happy to help!