Hi Mark,

Thanks for the question!

Yes, you can use Sea Foam Motor Treatment in your 2004 Kia Spectra with the 2.0L engine. It’s good to use in both the fuel and the oil.

For the best fuel-system cleaning, I’d recommend waiting until the tank is low, about 1/4 tank or less, then add a full 16 oz can and drive at least 10–20 miles before refueling. The higher concentration works much better and faster to clean fuel gum, varnish, and other deposits.

Since your Kia is an older vehicle, you could also use High Mileage Sea Foam for some additional cleaning strength.

For the oil, use 1 oz of Sea Foam per quart of oil, added 100–300 miles before your next oil change.

Thanks for the question, Ronald.

Yes, absolutely. For a high-mileage Ford F-150, I’d recommend High Mileage Sea Foam Motor Treatment. It’s a good cleaner for stubborn fuel residues and deposits that can build up over time.

Here’s what I’d do to get the most cleaning out of it:

• Wait until the tank is low, about 1/4 tank or less
• Add a full 16 oz can of High Mileage
• Drive at least 10–20 miles before refueling

The higher concentration works much better and faster to clean fuel gum, varnish, and other deposits than adding the same amount to a full tank.

You can also use Sea Foam in the engine oil at 1 oz per quart of oil, added 100–300 miles before your next oil change.

Great question, Neal. There’s two things I’d think about when considering fuel that sits for a while. First, you’ll want to think about cleaning up any fuel varnish that formed while the fuel sat. Second, you’ll want to think about preventing varnish from forming during future periods of inactivity, as well as preserving the fuel’s ignition vapors.

A tank of fuel that sat for three months will still be just fine to run.

I’d take two simple steps:

• First, especially if you’ve never done it before, run a strong cleaning concentration of Sea Foam High Mileage through your Sienna. That will clean up and fuel residues and deposits throughout the whole fuel system. It’s a great thing to do in any vehicle. A quarter tank is actually a perfect time to add Sea Foam. Here’s what I’d do: add an entire 16 oz can of Sea Foam High Mileage to your fuel tank, drive until almost empty (just don’t run out of gas), and then refill your tank. The high cleaning concentration will work much better and faster than adding Sea Foam to a full tank.
• Second, you can protect the fuel that sits in the tank by adding a can of Sea Foam High Mileage (or Motor Treatment) to every tank of fuel. Just add it before you fill up. That will help prevent gum and varnish from forming and prevent the fuel from degrading.

Hey Lonzo,

Thanks for the question. Yes, you can use High Mileage for your 2024 Civic. High Mileage is a great cleaner – it’s formulated to clean stubborn deposits and residues after years of buildup. But you can absolutely use it in a lower mileage vehicle too. It’ll do a good job cleaning up the fuel system.

Here’s what I’d do:

• Wait until the tank is low (about 1/4 tank or less)
• Add a full 16 oz can of High Mileage
• Drive at least 10–20 miles (or until nearly empty) before refueling

The high concentration works much better and faster to clean fuel residues and deposits than adding the same amount to a full tank.

Thanks for the question!

Yes, you can use another treatment right away. I’d recommend High Mileage Sea Foam since it’s formulated to be a strong cleaner for stubborn fuel residues and deposits. Here’s what I’d do:

• Wait until the tank is low (about 1/4 tank or less)
• Add a full 16 oz can of High Mileage
• Drive at least 10–20 miles (or until nearly empty) before refueling

The high concentration works much better and faster to clean fuel residues and deposits than adding the same amount to a full tank.

If deposits are causing the remaining rough idle and stalling, another high-concentration cleaning treatment should help. If the problem continues after cleaning, there may be another mechanical or ignition issue that needs to be checked.