Thanks for the question, Braden!

Sea Foam can be added to one-year-old gasoline, but it cannot restore fuel that has already degraded.

If the fuel still appears to be in good condition, Sea Foam can help stabilize it against further degradation and dissolve any gum and varnish that may have started to form. However, with fuel that’s already a year old, fresh gasoline is the safest choice, especially for a generator that you need to be reliable.

For future storage, add at least 1 ounce of Sea Foam per gallon of fresh fuel before storing, and run the generator long enough to draw the treated fuel throughout the fuel system. Sea Foam will help stabilize stored fuel for up to two years.

Thanks for the question, Debbie.

Sea Foam does not directly clean the catalytic converter. You should never pour or spray Sea Foam directly into the converter.

What Sea Foam Motor Treatment can do is clean fuel injectors, intake valves, pistons, and combustion chamber deposits. Keeping those areas clean helps the engine burn fuel more efficiently, which can reduce the amount of unburned fuel and deposits reaching the catalytic converter.

If an engine is running poorly because of fuel gum, varnish, or combustion deposits, Sea Foam can help address the problem upstream. However, it won’t repair a clogged, damaged, or failed catalytic converter.

Good question, Ron. With 177,000 miles, I’d recommend High Mileage Sea Foam Motor Treatment. It’s formulated as a strong cleaner for stubborn fuel residues and deposits that tend to build up in higher-mileage engines.

Since you’re noticing some sluggishness, here’s what I’d do to get the most out of a can of High Mileage:

• 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 injectors and other fuel system deposits. If deposits are contributing to the sluggish performance, cleaning them up can help restore lost performance.

Once it’s running well, you don’t necessarily need to use Sea Foam more often because of the mileage. For preventative maintenance, add 1-2 oz per gallon periodically to help keep everything clean.

Thanks for the question, Carl!

If you’re looking to clean the fuel system, I’d recommend using a high concentration of Sea Foam Motor Treatment.

Here’s what I’d do:

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

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

Once the engine is running well, you can switch to a maintenance dosage of 2 oz per gallon of fuel to help keep the fuel system clean and prevent gum and varnish from forming.

Thanks for the question, Terry!

Yes, you can use Sea Foam Motor Treatment in your Jeep. It’s compatible with any gas or diesel engine. Just follow the instructions on the can.

Here’s a little more info on how to use it:

• 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.

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