How much Sea Foam in full tank of fuel in 2006 Cadillac DTS? [SOLVED]

Good question, Vic. For cleaning, I’d recommend waiting until the tank is low in your Cadillac before adding Sea Foam. That will let you create a high cleaning concentration that works faster and better than adding the same amount to a full tank.

Here’s what I’d do: wait until the tank is low (1/4 -1/8 tank), add the whole 16 oz can, and then drive for at least 10-20 miles before refueling. It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits.

For storage or preventative maintenance, add at least 1 ounce of Sea Foam per gallon of fuel in the tank.