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How should I clean out my Jeep 2.5? #4481553
08/07/17 08:16 AM
08/07/17 08:16 AM
Joined: Apr 2008
Posts: 13,200
Central NY
Miller88 Offline OP
Miller88  Offline OP

Joined: Apr 2008
Posts: 13,200
Central NY
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 XJ
01 F-350 4x4 5M
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481575
08/07/17 08:43 AM
08/07/17 08:43 AM
Joined: Sep 2004
Posts: 8,014
Marshfield , MA
andyd Offline
andyd  Offline

Joined: Sep 2004
Posts: 8,014
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
Re: How should I clean out my Jeep 2.5? [Re: andyd] #4481579
08/07/17 08:46 AM
08/07/17 08:46 AM
Joined: Apr 2008
Posts: 13,200
Central NY
Miller88 Offline OP
Miller88  Offline OP

Joined: Apr 2008
Posts: 13,200
Central NY
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 XJ
01 F-350 4x4 5M
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481606
08/07/17 09:27 AM
08/07/17 09:27 AM
Joined: Apr 2010
Posts: 4,739
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline

Joined: Apr 2010
Posts: 4,739
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 (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (38k) - Castrol Edge Euro 0w40, MANN HU816X
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481639
08/07/17 10:00 AM
08/07/17 10:00 AM
Joined: Mar 2008
Posts: 6,085
South Florida
bubbatime Offline
bubbatime  Offline

Joined: Mar 2008
Posts: 6,085
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 Edge Syn 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 SuperTech Syn 5W20
06 GMC Sierra SuperTech 10W30


Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481647
08/07/17 10:06 AM
08/07/17 10:06 AM
Joined: Dec 2003
Posts: 10,091
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,091
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 :-)
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481670
08/07/17 10:30 AM
08/07/17 10:30 AM
Joined: Mar 2006
Posts: 2,404
in the shop
sw99 Offline
sw99  Offline

Joined: Mar 2006
Posts: 2,404
in the shop
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
2019 Ford F250 6.7L CCSB

Re: How should I clean out my Jeep 2.5? [Re: Eddie] #4481685
08/07/17 10:45 AM
08/07/17 10:45 AM
Joined: Apr 2008
Posts: 13,200
Central NY
Miller88 Offline OP
Miller88  Offline OP

Joined: Apr 2008
Posts: 13,200
Central NY
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 XJ
01 F-350 4x4 5M
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481711
08/07/17 11:22 AM
08/07/17 11:22 AM
Joined: Sep 2014
Posts: 1,550
Seattle-ish, WA
Oro_O Offline
Oro_O  Offline

Joined: Sep 2014
Posts: 1,550
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.

Re: How should I clean out my Jeep 2.5? [Re: Oro_O] #4481783
08/07/17 12:42 PM
08/07/17 12:42 PM
Joined: Mar 2008
Posts: 6,085
South Florida
bubbatime Offline
bubbatime  Offline

Joined: Mar 2008
Posts: 6,085
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 Edge Syn 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 SuperTech Syn 5W20
06 GMC Sierra SuperTech 10W30


Re: How should I clean out my Jeep 2.5? [Re: bubbatime] #4481851
08/07/17 02:04 PM
08/07/17 02:04 PM
Joined: Sep 2014
Posts: 1,550
Seattle-ish, WA
Oro_O Offline
Oro_O  Offline

Joined: Sep 2014
Posts: 1,550
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.

Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481874
08/07/17 02:28 PM
08/07/17 02:28 PM
Joined: Sep 2015
Posts: 6,177
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,177
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.
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481929
08/07/17 03:36 PM
08/07/17 03:36 PM
Joined: Apr 2017
Posts: 515
Fort Worth TX
TheKracken Offline
TheKracken  Offline

Joined: Apr 2017
Posts: 515
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
Re: How should I clean out my Jeep 2.5? [Re: Miller88] #4481943
08/07/17 03:45 PM
08/07/17 03:45 PM
Joined: Dec 2013
Posts: 780
Illinois, USA
Triton_330 Offline
Triton_330  Offline

Joined: Dec 2013
Posts: 780
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
Re: How should I clean out my Jeep 2.5? [Re: Oro_O] #4481989
08/07/17 04:41 PM
08/07/17 04:41 PM
Joined: Jan 2013
Posts: 2,496
Texas
WyrTwister Offline
WyrTwister  Offline

Joined: Jan 2013
Posts: 2,496
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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