How to use Sea Foam High Mileage

Yes, you can still use it. It’s simply a stronger cleaner. High Mileage is formulated to clean stubborn residues and deposits (it’s a great cleaner) that are often found in older vehicles, so it will work great to clean your Lexus and keep it that way. To get the most out of it, wait until you’ve got a low tank of fuel (1/8-1/4 tank or so) and add the whole can to the gas tank. Then, drive until almost empty before refueling. The high concentration works great to clean. Hope that helps!

Hi Mike,

You can safely leave Sea Foam Motor Treatment or Sea Foam High Mileage in there for the life of the oil. It won’t cause any harm.

Here’s the only reason we recommend adding it close to an oil change: Sea Foam reliquefies residues so they can be drained away with the old oil. In an older vehicle, Sea Foam will often cause new oil to become “dirty”/darker much sooner than it would otherwise (which is good, because that means the Sea Foam is cleaning!).

Adding Sea Foam 100-300 miles before your oil change gives the Sea Foam enough time to circulate and clean. You can then drain all the residue away when you change your oil.

Bottom line: it’s up to you. Safe either way.

Yes, Sea Foam products are safe for your Jeep Grand Cherokee. Here’s a rundown of popular products and which engines they are made for:

Sea Foam Motor Treatment: any gas or diesel engine

High Mileage Motor Treatment: any gas engine (this would work great in your Cherokee because it is formulated to clean stubborn deposits and residues that have formed in older vehicles)

Sea Foam Spray: any gas engine

Trans Tune: any transmission that takes petroleum-based transmission fluid (the vast majority, including your Cherokee)

Yes, Sea Foam works very well in high mileage trucks. Sea Foam cleans residues and deposits that commonly contribute to performance issues like rough idle, loss of power, etc.

I’d use High Mileage, which is formulated to clean heavy residues and deposits after years of buildup (it’s strong!). Wait until you have a low tank of fuel (1/8 of a tank or so). Add a full can of Sea Foam High Mileage and drive it until almost empty before refueling. The high concentration will do a great job cleaning.

Thanks for the question, Howard. In short, Sea Foam can help (sometimes quite a bit!) in older engines. Sea Foam cleans residues and deposits that commonly contribute to performance issues like the ones you are describing. Of course it won’t fix mechanical problems, but it will clean things up and help any problems that are caused by residues and deposits.

Here’s what I’d do (3 things), in any order:

One, wait until you have a low tank of fuel (1/8 of a tank or so). Add a full can of Sea Foam High Mileage and drive it until almost empty before refueling. The high concentration will do a great job cleaning. If you had to pick one way to use Sea Foam from this list, this would be it.

Two, when you’re about 100 miles from your next oil change, add High Mileage to the oil. Add 1 ounce of High Mileage per quart. Adding High Mileage will reliquefy oil residues and deposits that can restrict oil flow.

Three, do a Sea Foam Spray treatment through the air intake. This will clean intake valves and areas where the Sea Foam in the fuel won’t reach.