• 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.
• Sea Foam Motor Treatment in oil. Add 1 ounce of High Mileage per quart of oil in the crankcase. We recommend adding it 100-300 miles before your next oil change. That gives the High Mileage enough time to circulate and clean, and it allows all the reliquefied oil residues to be drained away with the old oil.
• Sea Foam High Mileage. High Mileage is formulated to clean stubborn residues and deposits. Use it in fuel and oil just like you would Sea Foam Motor Treatment.
• Sea Foam Spray through the intake. It cleans intake valves and upper engine areas where a fuel additive can’t reach.

Thanks for the question, Donald. My recommendation would be to use Sea Foam Spray through the carb and Sea Foam Motor Treatment or High Mileage in the fuel tank. If the engine still has a tendency to idle high sometimes, I’d recommend having a mechanic look at the carb. It would be a simple choke adjustment.

Yes, Sea Foam Motor Treatment (or High Mileage) is safe and effective in your Corvette. You can use it in the gas tank or in the oil. Just follow the directions on the can.

Also, it’s safe and effective to add a high concentration of Sea Foam to the gas tank to get the most cleaning benefit. Here’s what I like to do: add a full 16 oz can to a low tank of fuel (1/4-1/8 of a tank) and drive for at least 20 miles before refueling. That creates a high cleaning concentration of Sea Foam and gives it time to clean. It’s one of the best and most efficient ways to use it!

Thanks for the questions!

First, Sea Foam is safe and effective when mixed with other additives like Howes Anti Gel.

Second, Sea Foam keeps fuel from degrading for up to two years.

And third, add at least one ounce of Sea Foam per gallon in the tank.

(Also, note that Sea Foam is not a biocide or an anti gel. It works great to stabilize fuel and prevent it from degrading, as well as to clean the entire fuel system of fuel residues and deposits).

Yes, Sea Foam Motor Treatment (or High Mileage) is safe and effective in your 2016 Denali. You can add it to the gas tank or the oil crankcase. Just follow the directions on the can.

Also, it’s safe and effective to add a high concentration of Sea Foam to the gas tank to get the most cleaning benefit. Here’s what I like to do: add a full 16 oz can to a low tank of fuel (1/4-1/8 of a tank) and drive for at least 20 miles before refueling. That creates a high cleaning concentration of Sea Foam and gives it time to clean. It’s one of the best and most efficient ways to use it!