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.

Thanks for the question, Blaine! Here’s an overview. It depends why you’re using it:

• For preventative maintenance/fuel storage: 1 oz per gallon
• For fuel system cleaning/overcoming a fuel-related engine problem: 2 or more ounces per gallon. To maximize cleaning, add a full can (16 oz) to a low tank (2-3 gallons) and drive until almost empty before refueling.

Good question, Ed. Drive it until it’s almost empty, or at least 20 miles if you’re more comfortable with that. You want to make it through most of the treated fuel before you refill the gas tank.

Good question. If it’s been sitting since last fall or so, the fuel should have enough volatility to start and run just fine. However, Sea Foam won’t “restore” fuel volatility. It will help prevent any further breakdown, as well as reliquefy any fuel residues and varnish that have formed in the tank.

If you can drive it, here’s what I would do: I would drive it until almost empty, then add a can or two of Sea Foam with two gallons of fresh fuel. Then, drive the truck for at least 20 miles before refueling. That way you have the old gas purged out, followed by a high concentration of Sea Foam working through the fuel system to clean away any gum/varnish residue that would have formed while the truck sat.

If it’s going to be sitting for a while longer, go ahead and add a can of Sea Foam, and then follow the above when it’s ready to go.

Note: High Mileage Motor Treatment would be a good option too. It’s a strong cleaning formula for higher-mileage vehicles.