Thanks for the question, Corrie. Here’s how much and when to add Sea Foam in your 2012 Scion XB:

• 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. 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.

You could also try High Mileage Motor Treatment. It’s made specifically for stubborn residues and deposits in higher-mileage vehicles. It’s a great cleaner!

Yes, you can add Sea Foam in that amount in a 2001 Mazda MX5.

That said, if this is the first time you’re adding it, I’d recommend adding it to a low tank to create an even stronger cleaning 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.

Thanks for the question!

The short answer is yes, Sea Foam can be added to two-year-old gas. As you run the vehicle, it’ll work to clean any fuel residues that formed while it sat.

Note: Sea Foam won’t “restore” old fuel. It will reliquefy any fuel residues or deposits that formed while the vehicle sat, and prevent the fuel from degrading any further.

Here are a few additional thoughts. There are two things you’ll want to do with your vehicle: 1) use up the old fuel (or drain it), and 2) clean up the fuel system from any fuel residues and varnish that formed while the vehicle was sitting.

Two-year-old fuel should start up just fine. If you’re going to be using the vehicle frequently, drive it until you’re at about ¼ tank of gas, add an entire 16 oz can of High Mileage, and drive it until almost empty before refueling with fresh fuel. If you’re not going to be using it in the near future, drain the old fuel, add a can of High Mileage with 2-4 gallons of fresh gas, and drive it until almost empty.

The high concentration of High Mileage will do a good (and fast) job cleaning.

Thanks for the question, Alex!

I’d use Sea Foam Motor Treatment (red and white can) or High Mileage (black and silver can). Both are made to clean fuel residues and deposits. High Mileage is formulated as a strong cleaner for higher-mileage vehicles with years of stubborn buildup/deposits. Either one would work!

Can you use seafoam to clean gas tank

Hey Gary – yes, you can use Sea Foam to clean up a gas tank. If it’s in a vehicle, here’s what I’d to:

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.

If it’s a portable tank or you’ve removed it, here’s how I’d clean it then:

Drain the old fuel. Use a mixture of Sea Foam Motor Treatment (or High Mileage) and fresh fuel at a ratio of 50/50. That ratio will be plenty strong to clean. Pour the mixture in the tank, and let it sit for 24-48 hours. Make sure it’s filled above the “contamination line.” Periodically, move the fuel tank around to get the mixture of Sea Foam and gas moving. It is best if you can get a little heat inside the tank, so leave it outside as long as you can in direct sunlight if that’s an option. Sea Foam works better at higher temperatures. Dispose of the fuel/Sea Foam mix once finished.

Hope that helps and don’t hesitate to reach out if you have any other questions!