Another Seafoam thread
CF Veteran




Joined: Aug 2019
Posts: 1,467
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From: Littleton, CO
Year: '96
Model: Cherokee (XJ)
Engine: 4.0 HO
I didn't know if my last post was going to come across rude hahaha. I was saying that I had mentioned last week about the other two parts under the hood that constantly make a ticking noise, then on another subject I asked you if you could post a video. I didn't mean for it to seem like I had already asked you for a video last week hahaha. I went to try and watch it and it says this video is private
Thread Starter
CF Veteran
Joined: Oct 2018
Posts: 1,577
Likes: 279
From: United Kingdom
Year: 1995 RHD
Model: Cherokee (XJ)
Engine: 4.0l
It didn't, and the video should be viewable now. I did set it as unlisted when uploading but ti set it to private. Also my video's time stamp was 8 minute prior to my second post so may have been the louder noise that hasn't come back since.
Thread Starter
CF Veteran
Joined: Oct 2018
Posts: 1,577
Likes: 279
From: United Kingdom
Year: 1995 RHD
Model: Cherokee (XJ)
Engine: 4.0l
So the MMO arrived yesterday. It smells like dentists mouthwash, maybe that is the mystery.
I pumped a bit of its oil out the dipstick tube so have a small before MMO sample to compare with the after results.
I'll be sure to post some pictures of the 2 samples once I've clocked 500 miles or so.
I pumped a bit of its oil out the dipstick tube so have a small before MMO sample to compare with the after results.
I'll be sure to post some pictures of the 2 samples once I've clocked 500 miles or so.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
So the MMO arrived yesterday. It smells like dentists mouthwash, maybe that is the mystery.
I pumped a bit of its oil out the dipstick tube so have a small before MMO sample to compare with the after results.
I'll be sure to post some pictures of the 2 samples once I've clocked 500 miles or so.
I pumped a bit of its oil out the dipstick tube so have a small before MMO sample to compare with the after results.
I'll be sure to post some pictures of the 2 samples once I've clocked 500 miles or so.
Have a peek into the oil filler hole now and see how sludgy it is.
CF Veteran


Joined: Nov 2017
Posts: 2,478
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From: Southern Texas (former AZ & Aus)
Year: 1999
Model: Cherokee(XJ)
Engine: I6 4.0L
Is that also part of the "mystery" of MMO? lol
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Cause it's a waste of time trying to drain a quart, and 1 extra isn't gonna make a **** of difference.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran


Joined: Nov 2017
Posts: 2,478
Likes: 275
From: Southern Texas (former AZ & Aus)
Year: 1999
Model: Cherokee(XJ)
Engine: I6 4.0L
Was asking as unlike boxburn... my XJ currently with only 107k on the clock doesn't burn, leak or use any oil between changes. Stays steady as a rock

So that's why with mine already a tick or 2 above the full line I asked if the extra volume of a full qt of MMO would hurt anything.
And just to be clear... only reason I was intentionally running a little above the line is because I had that annoying flipping oil pressure sensor unit starting to leak like a sieve.
But didn't want to risk any foaming or anything from way too much volume in the crankcase.
CF Veteran


Joined: Nov 2017
Posts: 2,478
Likes: 275
From: Southern Texas (former AZ & Aus)
Year: 1999
Model: Cherokee(XJ)
Engine: I6 4.0L

That always releases some tension for me too...
Thread Starter
CF Veteran
Joined: Oct 2018
Posts: 1,577
Likes: 279
From: United Kingdom
Year: 1995 RHD
Model: Cherokee (XJ)
Engine: 4.0l
I need to work out where my oils going, need to add a quart litre every couple of months. I've already done the usual o-rings, rocker cover gasket, oil pressure sensor, no emulsification, exhaust smoke. But enough of that, I may create a thread about it if it continues after my oil change and I've cleaned the engine up.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I need to work out where my oils going, need to add a quart litre every couple of months. I've already done the usual o-rings, rocker cover gasket, oil pressure sensor, no emulsification, exhaust smoke. But enough of that, I may create a thread about it if it continues after my oil change and I've cleaned the engine up.
MMO may help there. Frees things up.
Have you peeked into the oil filler hole yet?
Thread Starter
CF Veteran
Joined: Oct 2018
Posts: 1,577
Likes: 279
From: United Kingdom
Year: 1995 RHD
Model: Cherokee (XJ)
Engine: 4.0l
Thread Starter
CF Veteran
Joined: Oct 2018
Posts: 1,577
Likes: 279
From: United Kingdom
Year: 1995 RHD
Model: Cherokee (XJ)
Engine: 4.0l
665 miles later I have done my oil change and took a look at my pre and post MMO samples. Visually there was no difference between the 2, both of the same appearance but I imagine if the MMO did clean anything up, it'll be in the old filter.
I did however have the return of the loud tick/clicking noise today the day after my oil change. It did not go away after a 10 second restart but went away after a short drive as it did previously.
My oil change was 5L of 10W-40 SS and 1L Lucas oil additive.


