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, 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!

Great question, Jessica, and you’re on the right track.

I’d use Sea Foam High Mileage. 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, including on injectors.

Thanks for the question!

I’d use High Mileage. It’s a really good cleaner that is formulated to remove stubborn deposits and residues.

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