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Unread 12-06-2014, 01:07 PM   #1
tsx500
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XJ guys...do you use carb/FI cleaner ?

i just picked up a '98 with only 78k original miles ...

do you guys recommend any kind of fuel treatment additive (to gas tank) carb/FI cleaner ? ? i stopped by my local auto parts store the other day just to see what they had...there are so many brands (Gumout, STP, Heet, Lucas, etc)... the salesperson singled-out a product called "Seafoam" , but for all i know, he was getting extra commish for pushing it !

thanx in advance for all advice on this

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Unread 12-06-2014, 02:07 PM   #2
mschi772
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I'm an annual user of Seafoam. There are about a bajillion threads about it around here. Every year I do 1/3 12 oz can in a tank of fuel, 1/3 can into my oil 50-100ish miles prior to oil change, and 1/3 can into the intake while engine running (don't pour too fast or you'll kill it). After the intake dose is in, turn the engine off for 5 min, then turn it back on and gun it a bit--DO THIS PART OUTSIDE because there will be a lot of smoke.
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Unread 12-06-2014, 03:40 PM   #3
jeepkid03
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I've run Seafoam in the gas tank before as well as Marvel Mystery Oil every so often. I have also used Techron fuel system cleaner. All of them seem to work okay. I wouldn't recommend putting Seafoam in the oil though. I've seen first hand what it does to an engine with any gunk in it. It clogs the oil pickup screen and you lose oil pressure.

Seafoam is a great cleaner, but it is very harsh which will loosen lots of gunk very quickly. I'm a fan of using Marvel Mystery Oil in small 4oz doses in the fuel tank. I do the same with my small engines and the carbs and pistons are always clean.
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Unread 12-06-2014, 05:08 PM   #4
mschi772
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Quote:
Originally Posted by jeepkid03 View Post
I've run Seafoam in the gas tank before as well as Marvel Mystery Oil every so often. I have also used Techron fuel system cleaner. All of them seem to work okay. I wouldn't recommend putting Seafoam in the oil though. I've seen first hand what it does to an engine with any gunk in it. It clogs the oil pickup screen and you lose oil pressure.

Seafoam is a great cleaner, but it is very harsh which will loosen lots of gunk very quickly. I'm a fan of using Marvel Mystery Oil in small 4oz doses in the fuel tank. I do the same with my small engines and the carbs and pistons are always clean.
You make a good point about not jumping straight to Seafoam in the oil, but after some cycles of a quality oil, Seafoam is nice for going that extra distance. Shell Rotella T6 or Pennzoil conventional (yellow bottle) are both fantastic oils in the 4.0 and after a few short change intervals can really keep a clean engine.

In two XJ's, I've never had any problems with this care regimen.

I'm NOT a fan of additives in oil. If your oil is lacking in some way, switch to an oil that isn't.
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Unread 12-06-2014, 07:27 PM   #5
skyway0018746
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Seafoam or techron first then marveles . All good honest products .
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Unread 12-07-2014, 10:05 AM   #6
CCKen
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My 2 cents: Use Techron (readily available). I use BG44K in the fuel tank. Nothing in the engine oil. BG44K is hard to find.

Shell Rotella T6 5W-40 will take care of your oil cleanliness needs.
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Unread 12-07-2014, 11:25 AM   #7
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Quote:
Originally Posted by CCKen View Post
My 2 cents: Use Techron (readily available). I use BG44K in the fuel tank. Nothing in the engine oil. BG44K is hard to find.

Shell Rotella T6 5W-40 will take care of your oil cleanliness needs.
This^^ based on years of experience with both products.

I have no faith in Seafoam. That smoke is the Seafoam burning, not the contaminants leaving your engine.
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Unread 12-07-2014, 12:25 PM   #8
mschi772
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No one ever said that the smoke was contaminants leaving the engine.

BG, Techron, Seafoam, Regane, Lucas... all potentially useful/beneficial when used properly.

Things like HEET are a different animal but are also useful if fuel lines freezing are a concern for you. Fuel stabilizers are also real and beneficial if you're storing something and the gas will be sitting for months (gasoline has a shelf life, and it is shorter than most people think).

Quote:
Originally Posted by cruiser54 View Post
I know nobody said that, but some folks think that's what it is.
Good point.
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Unread 12-07-2014, 12:28 PM   #9
cruiser54
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Quote:
Originally Posted by mschi772 View Post
No one ever said that the smoke was contaminants leaving the engine.

BG, Techron, Seafoam, Regane... all potentially useful/beneficial when used properly.

Things like HEET are a different animal but are also useful if fuel lines freezing are a concern for you. Fuel stabilizers are also real and beneficial if you're storing something and the gas will be sitting for months (gasoline has a shelf life, and it is shorter than most people think).
I know nobody said that, but some folks think that's what it is.
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

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Unread 12-07-2014, 12:37 PM   #10
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If you really want to clean out your combustion chambers use Chrysler Combustion Chamber Cleaner. Get it at your local Chrysler dealer.

Applied through the TB.
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Unread 12-07-2014, 12:39 PM   #11
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Quote:
Originally Posted by CCKen View Post
If you really want to clean out your combustion chambers use Chrysler Combustion Chamber Cleaner. Get it at your local Chrysler dealer.

Applied through the TB.
Great stuff!!

And then use BG44K in the tank once or twice a year.
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

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Unread 12-07-2014, 10:56 PM   #12
mescobedo90
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i use seafoam on all my vehicles
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Unread 12-08-2014, 06:24 AM   #13
cruiser54
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Lots of people do.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 12-08-2014, 09:15 AM   #14
mhall02
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Never ran anything thru the tank except 87 octane gas and only 10W30 conventional oil in the engine (Quaker State & Chevron Supreme).
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Unread 12-08-2014, 11:48 AM   #15
axlaxl
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Wading into these waters which have been beat to death, but just can't help myself.

I used to believe in Techron and always recommended it as the go to for fuel system cleaning. Then recently looked up their msds and was a bit surprised at what was actually in it. See attached image. Stoddard solvent aka turpentine and some naptha? Kind of pricey for what is in it. I believe in the past Techron used to use PEA which from what I've researched is really what you are looking for in regard to an in tank fuel additive to clean the system. Again, I know this has all been beaten to death so not trying to start another dead horse convo.

From the research I did I found that Redline Complete SI-1 had the most PEA at 30-50% as per the MSDS. Royal Purple's equivalent which costs about the same ounce for ounce contains 5-15% PEA. Lucas Oil's Deep Clean 10-30% PEA.

So do a little research as to what works and what doesn't. Again, not trying to say Techron is bad or that anyone's opinion on adding or not adding their cleaner of choice is a good, bad, or other idea. Just throwing out some info I think may or may not be relevant to the discussion.

Again this is just my humble 2 cents. I may be 100% wrong. Or not.
screen-shot-2014-12-08-12.32.29-pm.png

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