Thanks for the question, Robert. While you can add it to a full tank, I’d wait until you have a low tank of fuel.

Here’s what I’d do: To clean your carburetor’s fuel passageways, add a high concentration of Sea Foam to a low tank of fuel (1:2 ratio of Sea Foam to fuel). If you want to add 8 oz of Sea Foam, wait until you have 16 oz of fuel in the tank. Then, run the engine for about ten minutes, shut it off, and let it soak overnight. Take it for a ride the next morning and the Sea Foam/fuel mixture will have cleaned the carb, supposing that varnish restriction is causing your problem. Sea Foam Motor Treatment works very well to liquefy and clean heavy gum/varnish in carburetors. Sea Foam is always safe in all types of engines and it doesn’t contain harsh chemicals that could cause any harm. Hope this helps!

Thanks for the question, Alan. To get the most cleaning power out of a can of Sea Foam, 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.

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

Thanks for the question, Chris. No, when used as directed, Sea Foam products do not harm oxygen sensors or any other sensors. When applying Sea Foam Spray, just make sure you apply it downstream of the Mass Air Flow sensor (MAF sensor). Most MAF sensors are a safe distance upstream of the throttle plate anyway. Hope that helps and let me know if you have any other questions!

Thanks for the question, Danny.

Yes, you can absolutely use Sea Foam Motor Treatment in your 2020 Honda Ridgeline. Just follow the directions on the can.

Here’s what I’d do to get the most cleaning power:

• In the fuel: Wait until the tank is low (about 1/4 tank or less), add the full 16 oz can, and then 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.
• In the oil: Add 1 ounce of Sea Foam per quart of oil in the crankcase 100–300 miles before your next oil change. That gives the Sea Foam enough time to circulate and clean, and it allows the reliquefied oil residues and deposits to be drained away with the old oil.

Many people use Sea Foam as preventative maintenance to keep the fuel system and engine clean, even on newer vehicles like yours.

Thanks for the question, Mitiku. Yes, you can use both Sea Foam and Cataclean at the same time. They won’t interfere with each other.