Thanks for the question, Vern. Sea Foam Motor Treatment is made with 100% safe petroleum cleaning and lubricating ingredients. You can safely add a large amount of Sea Foam to your gas tank – there’s no such thing as “too much.” In fact, a high concentration of Sea Foam in the fuel tank works better and faster to clean than a low concentration. 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. It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits.

In the oil, do not exceed 1 ounce of Sea Foam per quart of oil.

Good question, Tyler.

For Sea Foam in the gas tank, yes, you can use the whole can. Adding a whole can to the gas tank is a great way to clean up the entire fuel system. 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. It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits.

In the oil, add 1 oz of Sea Foam per quart of oil. Do not exceed that ratio.

Good question, Paul. First off, add 1 oz of Sea Foam per quart of oil in your crankcase. Most cars and trucks have a capacity between 5-8 quarts, so I’m guessing that a full can would be too much. Do not add more than 1 oz per quart of oil.

Second, I’d recommend adding it 100-300 miles before your next oil change. You can drive it normally during that time. That gives the Sea Foam enough time to circulate and clean. It also lets you drain away all the reliquefied crud (residues and deposits) when you change your oil.

Hope that helps and let me know if there’s anything else!

Thanks for the question, Joe! Yes, you can use Sea Foam Motor Treatment in oil. Sea Foam reliquefies oil residues and deposits so they can be drained away with the old oil. We recommend adding it 100-300 miles before your next oil change. That gives the Sea Foam enough time to circulate and clean. It also lets you drain away all the reliquefied crud (residues and deposits) when you change your oil.

Add 1 oz of Sea Foam per quart of oil in the crankcase. Do not exceed this ratio.