Good question, Chelsea! We recommend adding Sea Foam to your gas tank every 3-5,000 miles, or once or twice a year. You can certainly add it more frequently, but doing one treatment in that time frame is plenty. High Mileage is a great choice as it’s a very good cleaner.

As far as how much High Mileage to use, here’s what I’d do: wait until the tank is low (1/4 -1/8 tank). Then, add the whole 16 oz can, and 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. By waiting until the tank is low, you can create a high cleaning concentration without having to use two cans.

Thanks for the question, Laura. Yes, you can add multiple cans of Sea Foam. I’d wait until you have a low tank (2-4 gallons) and add a can or two of Sea Foam (or Sea Foam High Mileage, which is a great cleaner.) Then, drive it until almost empty before refueling.

Using a high concentration is a great way to clean up fuel injectors. It wouldn’t hurt anything to add three cans, but it’s probably not necessary.

Great question, Alberto. We get asked about this a lot!

No, it’s not bad to add a lot of High Mileage to your fuel. In fact, a high concentration works much better and faster than a low concentration. High Mileage is made with 100% safe petroleum cleaning and lubricating ingredients, so it’s okay to add a lot to fuel.

I like to wait until I have a low tank of fuel (1/8 of a tank or so) and add an entire 16 oz can of High Mileage to the fuel. Then, I drive it until almost empty before refueling. That works very well to clean fuel residues and deposits from the entire fuel system.

I’d wait until your tank is low and add the rest of the High Mileage, drive it until almost empty, and then refill from there and drive it normally.

Thanks for the question, Dimitris! Yes, you can use High Mileage in a wet clutch engine. It’s safe and effective.