On my 2006 F250 6.0 v8, do I add the product to my oil or to my diesel fuel? [SOLVED]

Thanks for the question, Amner. You can use it in both diesel fuel and oil.

Here’s a little more info on how to use it:

• Sea Foam Motor Treatment in fuel. I like to 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 (or as far as you’re comfortable on a low tank). It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits. Add it to fuel like this every 3,000 miles or once a year.
• Sea Foam Motor Treatment in oil. Add 1 ounce of Sea Foam per quart of oil in the crankcase. 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. To help progressively clean up your oil crankcase, add it before every oil change

I’d start with the fuel tank if you’re only picking one, but using it in both fuel and oil will help clean things up.