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#3331390 - 04/02/14 01:03 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Papa Bear Offline


Registered: 08/11/05
Posts: 6774
Loc: Leamington, ON, Canada ..... r...
Originally Posted By: Raye7r
The oil light started coming on this winter.


Does it knock? Is it running OK?

If it's running alright then leave it alone and drive on.
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#3331536 - 04/02/14 03:51 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Raye7r Offline


Registered: 02/09/09
Posts: 11
Loc: Indiana
I'v changed the sender twice, it has a gauge also. Will have checked with mechanical gauge. Light just started coming on. Mail delivery vehicle so has a ton of idling time on it (5 hours to a hundred miles). Just called my NAPA and told them to bill me for a case of 15w50. No rattles, even when light on. Rattles good on startup though. Been a good one. You think new oil pump will help if pressure low.

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#3331582 - 04/02/14 04:57 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
eljefino Offline


Registered: 06/15/03
Posts: 31695
Loc: ME
You guys are on the wrong track with the right idea. wink

OP needs to either pull his thermostat or put in a 150-160 degree one. This will thicken up the oil more than going up a grade. Those jeeps have a mechanical and electric fan, IMO. Wire up the electric to be always on.

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#3331675 - 04/02/14 07:01 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
bullwinkle Offline


Registered: 10/09/04
Posts: 6881
Loc: Cincinnati, OH, USA
20W50 and a can or two of STP will raise it-but verifying actual low oil pressure would be a smart move.
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#3332068 - 04/03/14 08:51 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
rslifkin Offline


Registered: 06/27/10
Posts: 2750
Loc: Rochester, NY
On a 2000, the head probably cracked when it got hot (0331 head). Has it been losing coolant? If so, the bearings in the bottom end are probably shot if it's got low oil pressure, as the coolant has likely wiped them out.

If the oil isn't milky, no slime under the oil cap and it hasn't been losing coolant, then verify the pressure with a mech gauge and replace the oil pump if it's actually low (worn out oil pumps aren't uncommon on high mileage 4.0s).


Edited by rslifkin (04/03/14 08:52 AM)
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#3332125 - 04/03/14 09:42 AM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: rslifkin]
jeepman3071 Offline


Registered: 04/15/10
Posts: 3617
Loc: Storrs, Connecticut
Originally Posted By: rslifkin
On a 2000, the head probably cracked when it got hot (0331 head). Has it been losing coolant? If so, the bearings in the bottom end are probably shot if it's got low oil pressure, as the coolant has likely wiped them out.

If the oil isn't milky, no slime under the oil cap and it hasn't been losing coolant, then verify the pressure with a mech gauge and replace the oil pump if it's actually low (worn out oil pumps aren't uncommon on high mileage 4.0s).


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#3332273 - 04/03/14 12:36 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Miller88 Offline


Registered: 04/09/08
Posts: 12335
Loc: Onondaga County
A lot of times, 4.0s will run hot enough to evaporate the coolant so you don't end up with the milk on the oil cap ... even with a cracked head.
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#3332280 - 04/03/14 12:42 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Miller88]
rslifkin Offline


Registered: 06/27/10
Posts: 2750
Loc: Rochester, NY
Originally Posted By: Miller88
A lot of times, 4.0s will run hot enough to evaporate the coolant so you don't end up with the milk on the oil cap ... even with a cracked head.


Huh. When my mom's cracked the head, it had almost a 1/2" of slime under the valve cover and on the oil cap and valvetrain after a couple hundred miles (she noticed it losing coolant, I checked it out and found it before any lasting damage was done). It took forever to clean it all up before reassembly.
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#3332443 - 04/03/14 03:15 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
Donald Offline


Registered: 03/21/04
Posts: 19495
Loc: Upstate NY
Have you changed the oil filter since the light started to come on? If not that would be the first thing to do.

I had a 1994 Camry where the oil light would come on. Mechanical gauge confirmed oil pressure issues. Changed only the filter (Amsoil) and problem went away. Amsoil evaluated the filter and said the filter was full, but not defective. So unknown problem with a top quality filter.

Put on another 100K miles and never any more issues.
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#3332806 - 04/03/14 09:54 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
artificialist Offline


Registered: 09/23/07
Posts: 8440
Loc: Florida
If you really need an SAE40, you can probably get it at a marina because many boats still have a Detroit Diesel 2-cycle engine which needs SAE40.

I wouldn't use STP, approved oil already has the additives that are needed.
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#3333343 - 04/04/14 02:27 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
circuitsmith Offline


Registered: 12/17/09
Posts: 569
Loc: Wash, DC
If it's not the sender it's most likely worn main crank bearings causing low pressure at idle.
How many of you saying change the oil pump have actually seen a high mileage & low pressure problem fixed with a new pump?
The pump is low, closest to the sump so it's the last part to get starved of oil.
Normally it's constantly bathed in the oil at its coolest.
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#3333467 - 04/04/14 04:42 PM Re: What straight wt oil to try for 2000 RHD Cherokee [Re: Raye7r]
andyd Offline


Registered: 09/25/04
Posts: 6181
Loc: Marshfield , MA
The rattle on cold start up. Thats a worn thrust bearing on the crank. It prolly has a few miles left.But it is showing wear. I would switch to 20 w 50. I use it down to 10F in my cars which are specced for it.
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