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#4725745 - 04/13/18 12:33 PM Rear Main Seal concern???
BAJA_05 Offline


Registered: 02/04/18
Posts: 389
Loc: Berks County/Pa.
Getting ready to purchase my neighbors 2000 Dodge Ram 4WD 5.2L with the automatic transmission/overdrive tomorrow when he has off work in the morning. He is the original owner and its parked with exactly 93,014 original miles. Climbed underneath it today and noticed the rear main seal has small drops on it. He says he ran exclusively PYB 10W30 with a Mopar filter his whole ownership. What kinda job is it to replace a RMS or would throwing high mileage oils at it be my best bet for now? Does Liquid Moly not also make a product specifically for RMS leaks?

Note -- he bought a brand new 2018 Jeep Cherokee and his wife no longer wants the truck sitting in the driveway. I offered him $2500.00 and he said, "done deal!!!"

Dale


Edited by BAJA_05 (04/13/18 12:36 PM)
_________________________
2017 VW Jetta SE TSI 1.4L Turbo (hers)
M1 Euro 0W40 & FU (19K)
2008 Acura TL 3.2L QSHM 5W20 & FU (103K)
2005 Subaru Baja AWD 2.5L N/A 5spd.
Rotella T6 5W30 & Wix (91K)

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#4725756 - 04/13/18 12:42 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
rollinpete Offline


Registered: 03/20/17
Posts: 501
Loc: West Ma.
You could try using some HM oil and it may stop.
Replacing the seal involves a lot of work, at the minimum transmission has to come out along with the transfer case.
_________________________
Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive183k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).


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#4725758 - 04/13/18 12:42 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
Tdbo Offline


Registered: 08/18/09
Posts: 3237
Loc: Ohio
You could try some HM in it and see if it makes a difference.
IMO, it makes more sense to monitor it, and if it is "only a few drops,"
top off if necessary.
That's what I do on my '03.
Doesn't make sense on an 18 year old truck to replace it unless the leakage becomes severe, or other repairs make the replacement feasible.
_________________________
2012 Honda Accord LX-P 92K
2008 Ford Mustang Pony Package Convertible 16K
2006 Honda Odyssey EX-L 76K
2003 Ford Ranger 3.0 Supercab 108K

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#4725768 - 04/13/18 12:49 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
oldhp Offline


Registered: 06/28/12
Posts: 1654
Loc: USA
Valvoline MaxLife High Mileage 10W30 would be my choice for the rest of it's life.
_________________________


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#4725784 - 04/13/18 01:05 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
Lubener Offline


Registered: 01/22/11
Posts: 2612
Loc: N.Ohio
For a few small drops, I would do nothing until it puddles on the driveway.
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#4725792 - 04/13/18 01:14 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
RamFan Offline


Registered: 05/09/10
Posts: 1986
Loc: Illinois, U.S.A
Do 2-3 OCIs with a HM oil and see if that stops the leak. The cost difference is negligible if you buy on a sale/clearance.
_________________________
06 Monte Carlo LT
+3.9l V6 - 189k - Defy/Motorcraft 10w30 - EcoGard Synthetic - OLM
16.5 CX-5 Touring
+2.5l I4 - 46k - SynPower 0w20 - PureOne - 8.5k/1yr

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#4725793 - 04/13/18 01:15 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
WhiteLX Offline


Registered: 06/06/09
Posts: 3
Loc: Riverside, CA
Rear main seals are cheap, usually only a few bucks. The problem is the labor involved as the transmission must come out to change the seal. I had a bad rear main leak on the Explorer I purchased in October. I researched a lot on stop leaks and tried blue devil rear main sealer along with 10w30 Maxlife. Within 3K the leak has been greatly reduced. I used to have a large puddle under the engine. Now it's just a tiny spot, if any.

For a few small drops I'd agree, start with Maxlife and go from there.
_________________________
1992 Mustang 5.0L notchback - turbocharged
1986 Merkur XR4Ti - 2.3L turbo
1998 Ford Explorer 5.0L
2006 Toyota Corolla

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#4725794 - 04/13/18 01:15 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
Reddy45 Offline


Registered: 08/15/08
Posts: 3025
Loc: USA
Don't plan on fixing a RMS leak with chemicals. Decide if you can live with it or maybe you have the resources to fix it yourself.

I just got in the habit of keeping a drip tray under the truck when it was parked and checked the oil level often. Surprisingly even with the leak being about a half teaspoon a day the oil level never dropped noticeably in 5k OCIs.

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#4725812 - 04/13/18 01:32 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
Chris142 Offline


Registered: 06/05/03
Posts: 16967
Loc: Deplorable in apple valley, ca
The oil pressur sender is on the rear of the engine, behind the distributer. It may be leaking and running down.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4725824 - 04/13/18 01:55 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
rollinpete Offline


Registered: 03/20/17
Posts: 501
Loc: West Ma.
Another (senerio) is the oil red?, could be the transmission fluid.
_________________________
Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive183k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).


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#4725867 - 04/13/18 02:43 PM Re: Rear Main Seal concern??? [Re: rollinpete]
BAJA_05 Offline


Registered: 02/04/18
Posts: 389
Loc: Berks County/Pa.
No, its not red -- its motor oil.
_________________________
2017 VW Jetta SE TSI 1.4L Turbo (hers)
M1 Euro 0W40 & FU (19K)
2008 Acura TL 3.2L QSHM 5W20 & FU (103K)
2005 Subaru Baja AWD 2.5L N/A 5spd.
Rotella T6 5W30 & Wix (91K)

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#4725873 - 04/13/18 02:50 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
SatinSilver Offline


Registered: 01/24/08
Posts: 10341
Loc: OH
I'd leave it and use red bottle Maxlife. May want to replace the pcv valve with an oem unit as well.

I had a 99 Accord 4cyl that had a oozing rms. First Honda dealer quoted $700, second dealer quoted $500. Contacted Honda and they agreed to pay half. So cost $250 but afterwards noticed a flare from 1st to 2nd gear. They did a drain and fill on the trans which took care of that. In hindsight I would have left it alone.

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#4725941 - 04/13/18 04:10 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
JC1 Offline


Registered: 11/29/08
Posts: 3063
Loc: Oshawa, Ontario Canada
+1 on maxlife high mileage oil. I would also add a bottle of liqui Moly motor oil saver and see if that stops it.

https://www.amazon.com/Liqui-Moly-2020-Motor-Saver/dp/B00CPL8WY8
_________________________
2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter

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#4726010 - 04/13/18 05:39 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
zrxkawboy Offline


Registered: 11/30/04
Posts: 1770
Loc: SD
Since he has always used PYB, I'd try some PHM 10W30 for a couple of OCIs. BTW, I think you got a great deal on that truck, especially since it's a one-owner vehicle!
_________________________
"Think of all the Ford owners who will someday want an automobile." John Dodge


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#4726022 - 04/13/18 05:54 PM Re: Rear Main Seal concern??? [Re: BAJA_05]
Trav Offline


Registered: 11/20/06
Posts: 19321
Loc: MA, Mittelfranken.de
I wouldn't put anything in the oil or run a HM oil, just keep an eye on it. If all else fails park it nose down and when you cant throw this under it. Sounds funny but not kidding.


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