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#4481553 - 08/07/17 08:16 AM How should I clean out my Jeep 2.5?
Miller88 Offline


Registered: 04/09/08
Posts: 12701
Loc: Onondaga County
I just picked up a real pile of a Jeep. 133K miles on it. It has the venerable 2.5L AMC engine in it.

I know it's been overheated a few times. It has recently had a new water pump, fan clutch put in it, but still overheats.

Because of it's overheating, it has some black crusties in the oil. I know the previous owner only put a few hundred miles on it total, after doing an oil change, and the oil is already black and has some crusty in it. Similar problem happened to a friend's 4.0L that was severely overheated; it had crusty stuff in it and it plugged the oil pickup tube.


This is not going to be a reliable highway cruiser. It's so rusty. Just going to use it as a woods toy that occasionally sees the road. Beat it for a year or so and then sell what's good and scrap the rest. So I'm not pulling the oil pan and cleaning it out.

Should I ...
(1) Supertech 15w-40 - it seems HDEO is often recommended.
(2) Supertech 10w-30 for a short OCI
(3) Douse it in MMO and do an oil change and see what happens
(4) Kerosene / Diesel in sump!?

This is more of an experiment to see what happens. It won't see much highway, but will be lugged around on rocks and stuff or bounce off the rev limiter in mud (yuck).

Low dollar so the filter will, of course, be supertech.
_________________________
18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M

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#4481575 - 08/07/17 08:43 AM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
andyd Offline


Registered: 09/25/04
Posts: 7136
Loc: Marshfield , MA
I would fix whatever is causing the overheat first. Only then would I change the oil and filter. please post results TIA
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4481579 - 08/07/17 08:46 AM Re: How should I clean out my Jeep 2.5? [Re: andyd]
Miller88 Offline


Registered: 04/09/08
Posts: 12701
Loc: Onondaga County
Originally Posted By: andyd
I would fix whatever is causing the overheat first. Only then would I change the oil and filter. please post results TIA


The coolant is full of rust. My guess is no one ever changed the coolant. It already has a flush and fill kit. I'm replacing the radiator and thermostat before driving it any more.

Seems to be somewhat of a thermostat issue. When it starts the temperature cycles between 240 and 180, then after about 20 minutes of driving it settles between 210 and 220 ... which is more or less ideal.
_________________________
18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M

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#4481606 - 08/07/17 09:27 AM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4206
Loc: Storrs, Connecticut
+1 fix the overheating.

I'd run a HDEO and a good filter, or maybe a really good cleaning PCMO like PYB 10w30.

Don't use any kind of heavy duty cleaners unless you plan on pulling the valve cover and oil pan to clean them first, that will only clog up the pickup screen and oil passages.
_________________________
2000 Jeep Cherokee 4.0L (179k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (32k) - Castrol Edge Euro 0w40, MANN HU816X

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#4481639 - 08/07/17 10:00 AM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
bubbatime Offline


Registered: 03/18/08
Posts: 5622
Loc: South Florida
SuperTech 15W40.

Like said above, throwing heavy duty cleaners in a gunked engine will just clog up the pickup screen.
_________________________
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4481647 - 08/07/17 10:06 AM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
Eddie Offline


Registered: 12/07/03
Posts: 9559
Loc: Florida, Cape Coral
Sounds like a needed overhaul to me or it's going to be one problem after another for life. Ed
_________________________
CX5 Touring 2.5L :-)

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#4481670 - 08/07/17 10:30 AM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
sw99 Offline


Registered: 03/22/06
Posts: 2120
Loc: Colorado
How about Delo 10w30 HDEO. Its $16 at WM and should do a nice job and it a tad bit lighter.
_________________________
2016 Nissan Versa S 1.6L
2018 Subaru Outback 2.5i
2018 Ford F350 6.2L


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#4481685 - 08/07/17 10:45 AM Re: How should I clean out my Jeep 2.5? [Re: Eddie]
Miller88 Offline


Registered: 04/09/08
Posts: 12701
Loc: Onondaga County
Originally Posted By: Eddie
Sounds like a needed overhaul to me or it's going to be one problem after another for life. Ed


A year from now, this jeep will be sitting in the junkyard.

Originally Posted By: sw99
How about Delo 10w30 HDEO. Its $16 at WM and should do a nice job and it a tad bit lighter.


That's an option too. HDEOs are good.
_________________________
18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M

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#4481711 - 08/07/17 11:22 AM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
Oro_O Offline


Registered: 09/20/14
Posts: 1351
Loc: Seattle-ish, WA
Before I did much, I'd test the head gasket. Maybe do a citric acid flush on the cooling system and see what that shakes out.

But then for the oil, here is what I would do:

1) Drain 2 qts of oil out, add 2 qts Diesel/kerosene then flush. 2 x 20 mins flushes.
2) Dump that out, then add the old 2 qts back in, + 1 qt MMO and enough other oil to top up.
3) Run that a 100 miles or so to clean more, flush out kerosene, etc.
4) Dump that out and run good oil w/a pint of MMO in it.

This vehicle is an excellent candidate for that.

As to "good" oil, M1 10w-30 HM is just under $13/5qts at WM after rebate. Can't beat that deal with a stick. (MMO is 3.88qt there) It's going to be better than any HDEO in this situation; I've tried Delo and Delvac for problem engines and this oil works better.

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#4481783 - 08/07/17 12:42 PM Re: How should I clean out my Jeep 2.5? [Re: Oro_O]
bubbatime Offline


Registered: 03/18/08
Posts: 5622
Loc: South Florida
Originally Posted By: Oro_O

But then for the oil, here is what I would do:

1) Drain 2 qts of oil out, add 2 qts Diesel/kerosene then flush. 2 x 20 mins flushes.
2) Dump that out, then add the old 2 qts back in, + 1 qt MMO and enough other oil to top up.
3) Run that a 100 miles or so to clean more, flush out kerosene, etc.
4) Dump that out and run good oil w/a pint of MMO in it.

This vehicle is an excellent candidate for that.

As to "good" oil, M1 10w-30 HM is just under $13/5qts at WM after rebate. Can't beat that deal with a stick. (MMO is 3.88qt there) It's going to be better than any HDEO in this situation; I've tried Delo and Delvac for problem engines and this oil works better.



Well good thing that engine isn't yours, because that is just stupid.

Fix the fan/radiator/thermostat overheating problem, change the oil with the cheapest 30 or 40 weight you can find (SuperTech 15W40 is good), done.
_________________________
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4481851 - 08/07/17 02:04 PM Re: How should I clean out my Jeep 2.5? [Re: bubbatime]
Oro_O Offline


Registered: 09/20/14
Posts: 1351
Loc: Seattle-ish, WA
Originally Posted By: bubbatime


Well good thing that engine isn't yours, because that is just stupid.


Actually did it to my SUV engine last week. Vast improvement.

It's actually an MB factory proceedure, btw.

I'll take a little stupid over a 'whole lotta ignorant any day. One isn't your fault, the other sure is.

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#4481874 - 08/07/17 02:28 PM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
BrocLuno Offline


Registered: 09/06/15
Posts: 5508
Loc: Kalifornia Kollective
Or, just run 5W-40 HDEO and a full can of BG109 at each change. Oversized filter if you can make one work. Change at at 2,500 miles. Since it won't see the road much, that might be a year ...
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4481929 - 08/07/17 03:36 PM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
TheKracken Offline


Registered: 04/18/17
Posts: 515
Loc: Fort Worth TX
Oro's flush doesnt seem stupid at all unless you know your engine is extremely sludged...in which case I wouldnt risk it.

I like amsoil flush for a lighter strength flush and the liqui moly if I need something stronger.
_________________________
2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
04 Toy Sienna awd: Pennzoil 0w20 281k Miles

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#4481943 - 08/07/17 03:45 PM Re: How should I clean out my Jeep 2.5? [Re: Miller88]
Triton_330 Offline


Registered: 12/24/13
Posts: 780
Loc: Illinois, USA
If it's just gonna be a beater to use in off-roading for a year, I wouldn't hesitate to do a quick kerosene flush - 80% oil, 20% kerosene, idle for 5 to 10 minutes. After the flush, just run whatever's cheapest. If both ST 10w-30 and ST 15w-40 cost the same, I'd run the 15w-40.
_________________________
2001 Ford F-150 XLT 4x4 5.4L V8 ~132k miles
-> PPHM 5w-20 w/Fram Ultra
1989 Chevrolet Camaro RS 5.0L TBI V8 ~48k miles
-> Milesyn SB 5w-30 w/Puro Boss

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#4481989 - 08/07/17 04:41 PM Re: How should I clean out my Jeep 2.5? [Re: Oro_O]
WyrTwister Offline


Registered: 01/13/13
Posts: 1504
Loc: Texas
Originally Posted By: Oro_O
Before I did much, I'd test the head gasket. Maybe do a citric acid flush on the cooling system and see what that shakes out.

But then for the oil, here is what I would do:

1) Drain 2 qts of oil out, add 2 qts Diesel/kerosene then flush. 2 x 20 mins flushes.
2) Dump that out, then add the old 2 qts back in, + 1 qt MMO and enough other oil to top up.
3) Run that a 100 miles or so to clean more, flush out kerosene, etc.
4) Dump that out and run good oil w/a pint of MMO in it.

This vehicle is an excellent candidate for that.

As to "good" oil, M1 10w-30 HM is just under $13/5qts at WM after rebate. Can't beat that deal with a stick. (MMO is 3.88qt there) It's going to be better than any HDEO in this situation; I've tried Delo and Delvac for problem engines and this oil works better.



What is MMO ?

Thanks , :-)
_________________________
Wyr
God bless

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