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#4618124 - 12/29/17 07:12 PM 1984 jeep 2.5,winter oil
troutfisher Online   content


Registered: 09/05/16
Posts: 56
Loc: appalachia va
Hello,just picked up a 1984 jeep/amc cherokee xj with 2.5 i-4

Runs great,195k on the clock

First thing I did was change the oil,had a driveworks filter on it.Changed it out with a carquest red and 4 quarts of supertech 10w-30 dino,is this a good combo for 15f-30f temps?

Is super tech 10w-30 good for this engine or should I go with a syn blend? Any help would be great


Edited by troutfisher (12/29/17 07:12 PM)

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#4618127 - 12/29/17 07:14 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
dlundblad Offline


Registered: 09/30/13
Posts: 10205
Loc: Indiana
ST 10w30 is a good combination for sure.

Is this a toy or a daily driver? Just curious.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4618137 - 12/29/17 07:22 PM Re: 1984 jeep 2.5,winter oil [Re: dlundblad]
troutfisher Online   content


Registered: 09/05/16
Posts: 56
Loc: appalachia va
Daily Driver,4x4 is a must where I live

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#4618147 - 12/29/17 07:32 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
ammolab Online   content


Registered: 01/16/06
Posts: 1005
Loc: Ruidoso, NM USA
Our 2.5 runs great on 5W-30 Maxlife.
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1994 Jeep Wrangler 2.5L
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#4618153 - 12/29/17 07:37 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
dieselfarmboy Offline


Registered: 06/07/15
Posts: 20
Loc: md, usa
Use to have one of them. 4x4 never worked due to vacuum lines or axle disconnect or transfer case switch. Never ran good was a [censored] of engine part jeep part ford part who knows what else they used. Good luck.

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#4618175 - 12/29/17 07:48 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
BrocLuno Offline


Registered: 09/06/15
Posts: 5625
Loc: Kalifornia Kollective
With a 195,000 on it, I'd prolly switch to Maxlife 5W-30 or 10W-40 smile
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#4618180 - 12/29/17 07:53 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
dishdude Online   content


Registered: 11/14/08
Posts: 8834
Loc: Phoenix
1984 should be the Pontiac 2.5. I'd say you're good with the ST 10w-30.
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#4618192 - 12/29/17 08:01 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1671
Loc: Crawfordville FL
10w-30 will be fine. Go to 10-40 if you find the engine needs it
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2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4618199 - 12/29/17 08:05 PM Re: 1984 jeep 2.5,winter oil [Re: dishdude]
dieselfarmboy Offline


Registered: 06/07/15
Posts: 20
Loc: md, usa
Originally Posted By: dishdude
1984 should be the Pontiac 2.5. I'd say you're good with the ST 10w-30.


Pretty sure it was an AMC engine. They used some ford electronics on it. The carb was a night mare from what I remember. Id be more worried about starting a carbed engine in the cold then what oil is in it. At that mileage if it is true, it has to be TIRED.

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#4618217 - 12/29/17 08:16 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
troutfisher Online   content


Registered: 09/05/16
Posts: 56
Loc: appalachia va
This was a old park service jeep,so it had pretty good maintenance,the carb is definitely newer

engine runs perfect even in the coldest temps,gonna stick with the 10w-30 might try mobile super,with a wix for the long term


Edited by troutfisher (12/29/17 08:16 PM)

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#4618220 - 12/29/17 08:20 PM Re: 1984 jeep 2.5,winter oil [Re: dieselfarmboy]
dishdude Online   content


Registered: 11/14/08
Posts: 8834
Loc: Phoenix
Originally Posted By: dieselfarmboy
Originally Posted By: dishdude
1984 should be the Pontiac 2.5. I'd say you're good with the ST 10w-30.


Pretty sure it was an AMC engine. They used some ford electronics on it. The carb was a night mare from what I remember. Id be more worried about starting a carbed engine in the cold then what oil is in it. At that mileage if it is true, it has to be TIRED.


You're right.
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#4618223 - 12/29/17 08:22 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
dlundblad Offline


Registered: 09/30/13
Posts: 10205
Loc: Indiana
Originally Posted By: troutfisher
Daily Driver,4x4 is a must where I live


Basically the 4.0's little brother then?

I'd run a 10 or 5w40 personally.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4618230 - 12/29/17 08:30 PM Re: 1984 jeep 2.5,winter oil [Re: dieselfarmboy]
andyd Offline


Registered: 09/25/04
Posts: 7293
Loc: Marshfield , MA
Originally Posted By: dieselfarmboy
Use to have one of them. 4x4 never worked due to vacuum lines or axle disconnect or transfer case switch. Never ran good was a [censored] of engine part jeep part ford part who knows what else they used. Good luck.
I ha 2 grand wags with the vacuum switched front ends. All kinds of of horror stories about trying a cable operation, etc. One afternoon, I fixed the problem with 5' of vacuum hose. AMC, in its thriftiness, used a few pieces of steel tubing run hard and tight under the left exhaust maniifold. Thin steel. It rotted out. Routing the replacement hose cable tied to the fender fixed it for good. Cost <5$ The Grand Wag had about 30 feet of vacuum hose under the hood. The potential for leaks was massive as the cars aged.
_________________________
'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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#4618247 - 12/29/17 08:45 PM Re: 1984 jeep 2.5,winter oil [Re: andyd]
dieselfarmboy Offline


Registered: 06/07/15
Posts: 20
Loc: md, usa
Originally Posted By: andyd
Originally Posted By: dieselfarmboy
Use to have one of them. 4x4 never worked due to vacuum lines or axle disconnect or transfer case switch. Never ran good was a [censored] of engine part jeep part ford part who knows what else they used. Good luck.
I ha 2 grand wags with the vacuum switched front ends. All kinds of of horror stories about trying a cable operation, etc. One afternoon, I fixed the problem with 5' of vacuum hose. AMC, in its thriftiness, used a few pieces of steel tubing run hard and tight under the left exhaust maniifold. Thin steel. It rotted out. Routing the replacement hose cable tied to the fender fixed it for good. Cost <5$ The Grand Wag had about 30 feet of vacuum hose under the hood. The potential for leaks was massive as the cars aged.


If I had to deal with one again id see if I could swap a newer axle under it. My current Grand Cherokees front axle spins all the time and it dont seem to affect fuel mileage that much.

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#4618304 - 12/29/17 09:48 PM Re: 1984 jeep 2.5,winter oil [Re: troutfisher]
Alex_V Offline


Registered: 04/10/16
Posts: 1174
Loc: Campbellsville, KY
The 2.5 is tough. Doesn't get a lot of credit because most of the vehicles it was put in needed 30 more horsepower than it could give, but they'll go a long time and I've personally gotten 24 MPG with one in an XJ.

With that many miles, in warmer weather I'd bump up to a HM or syn blend, or 10w40, but 10w30 is one of the best weights for your engine even if it's substantially colder than that.
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