Thanks for the question, Don.

For your 2023 Street Glide with a 6 gallon tank, here are a few good guidelines:

For regular preventative maintenance:

Add 1 ounce of Sea Foam per gallon of fuel (so about 6 ounces for a full tank).
That will help keep the fuel system clean and prevent gum and varnish from forming.

For cleaning (best way to get the most out of a can of Sea Foam):

The best way to get the most cleaning power is to use a higher concentration. Here’s what I’d do:

• Wait until the tank is low (1–2 gallons)
• Add a full 16 oz can of Sea Foam
• Ride it for at least 10–20 miles before refueling

That gives the treated fuel time to work through the system. The higher concentration works much better and faster to clean fuel residues and deposits.

For storage:

Add at least 1 ounce per gallon before storing the bike. Sea Foam will help stabilize the fuel and prevent gum and varnish from forming while it sits.

You don’t have to be exact with measurements. Sea Foam is petroleum-based and okay to use in higher concentrations.

Thanks for the question, Vincent!

In your case, I’d recommend High Mileage Motor Treatment. It’s formulated as a strong cleaner for stubborn fuel residues and deposits. It would work well in your Chrysler.

Here’s what I’d do to get the most cleaning power out of it, for injectors and the entire fuel system:

• 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 than adding it to a full tank.

You can also add High Mileage to the oil if you’d like to clean oil residues. Add 1 ounce per quart of oil in the crankcase, 100–300 miles before your next oil change.

Hope that helps and let me know if you have any other questions!

Thanks for the question, Robert. You’re on the right track – adding 2+ ounces is a great cleaning dose. Sea Foam is petroleum-based, so it’s safe to run at higher concentrations. In fact, a stronger concentration works better and faster if you’re trying to clean things up.

If you want to do a deeper clean once in a while, you can:

• Wait until you have a low tank of fuel
• Add 2+ ounces (I like to add an entire 16 oz can to 1-3 gallons of fuel)
• Use up as much of the treated fuel as possible before you refill the tank

That higher concentration helps liquefy and clear out any gum and varnish that may be starting to build up.

2 oz per gallon still works great as a preventative maintenance dose if you add it to every tank. Adding a higher concentration is good if you want an occasional strong cleaning dose.

Thanks for the question, David, and congrats on the RV!

To clean up the fuel system, your goal will be to create a relatively high cleaning concentration of Sea Foam to fuel. Wait until you have a low tank of fuel (1/4 tank or less), and add 3-6 oz of Sea Foam per gallon of fuel (three 16 oz cans would be a good cleaning concentration; you can also get 20 oz Truck & SUV size cans that would work great too). Drive at least 20 miles before refueling with fresh fuel (or as long as you are comfortable with on a low tank). That gives the treated fuel time to work through the system and clean.

Thanks for the question, David. Use Marine PRO. It will clean and lubricate the entire fuel system, as well as prevent gum and varnish from forming in fuel. Works great in marine applications.

Here’s how I’d recommend using it depending on what your goals are:

• For routine, everyday maintenance: add 1 ounce of Sea Foam per gallon of fuel. It does come in 1-gallon jugs that you can get at NAPA or other auto parts stores (you might have to have them order it, but I looked up a NAPA in your area and it said they could ship to store for pickup the same day). Adding Marine PRO to every tank of fuel is best practice for keeping a fuel system clean and preventing common fuel-related problems
• For periodic high-concentration cleaning, wait until you have a low tank of fuel (1/4 tank or so), add a high concentration of Marine PRO (at least 2-4 oz of Marine PRO per gallon of fuel), and use up as much of the treated fuel as you’re comfortable with before refueling.