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2003 Grand Marquis differential oil change #4505537
09/02/17 02:00 PM
09/02/17 02:00 PM
Joined: Mar 2008
Posts: 6,141
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,141
Michigan
Did my first ever rear differential oil change. (Have owned mostly front wheel drive)

I found it pretty easy to do. Bolts on cover broke free easily. Oil hole bolt took a little heat and liquid wrench.

I used some rtv for differentials to seal it back up and cleaned gears good with brake cleaner. Decided to use Mobil 1 75-90 in it.

I think this was the first change for it being the transmission fluid had never been changed.

Last edited by ZZman; 09/02/17 02:02 PM.

2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: 2003 Grand Marquis differential oil change [Re: ZZman] #4505569
09/02/17 02:39 PM
09/02/17 02:39 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Where's the question ?

Re: 2003 Grand Marquis differential oil change [Re: ZZman] #4505598
09/02/17 03:29 PM
09/02/17 03:29 PM
Joined: May 2009
Posts: 2,304
WA (USA)
Y_K Offline
Y_K  Offline
Joined: May 2009
Posts: 2,304
WA (USA)
How many miles?


"This forum talking about 4wd systems is like when other forums talk about oil."
Re: 2003 Grand Marquis differential oil change [Re: Y_K] #4505602
09/02/17 03:34 PM
09/02/17 03:34 PM
Joined: Mar 2008
Posts: 6,141
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,141
Michigan
Originally Posted By: Y_K
How many miles?


129,000


2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: 2003 Grand Marquis differential oil change [Re: Merkava_4] #4505604
09/02/17 03:36 PM
09/02/17 03:36 PM
Joined: Mar 2008
Posts: 6,141
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,141
Michigan
Originally Posted By: Merkava_4
Where's the question ?


What do you think of M1 75-90?


2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: 2003 Grand Marquis differential oil change [Re: ZZman] #4505645
09/02/17 04:17 PM
09/02/17 04:17 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Originally Posted By: ZZman
What do you think of M1 75-90?


It will be fine.

Re: 2003 Grand Marquis differential oil change [Re: ZZman] #4505663
09/02/17 04:49 PM
09/02/17 04:49 PM
Joined: May 2009
Posts: 2,304
WA (USA)
Y_K Offline
Y_K  Offline
Joined: May 2009
Posts: 2,304
WA (USA)
Wasn't 2003 the year of soft transaxle disaster on panthers? Heavy oil may help somewhat if it was.


"This forum talking about 4wd systems is like when other forums talk about oil."
Re: 2003 Grand Marquis differential oil change [Re: Y_K] #4505670
09/02/17 04:54 PM
09/02/17 04:54 PM
Joined: Mar 2008
Posts: 6,141
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,141
Michigan
Originally Posted By: Y_K
Wasn't 2003 the year of soft transaxle disaster on panthers? Heavy oil may help somewhat if it was.


Not sure... But it wasn't giving me any issues and calls for the weight I bought.


2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: 2003 Grand Marquis differential oil change [Re: ZZman] #4505702
09/02/17 05:35 PM
09/02/17 05:35 PM
Joined: Jun 2013
Posts: 525
Albany, NY
ford46guy Offline
ford46guy  Offline
Joined: Jun 2013
Posts: 525
Albany, NY
Limited slip? I think all MGMs have TC, so probably not.


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 2003 Grand Marquis differential oil change [Re: ZZman] #4505772
09/02/17 07:03 PM
09/02/17 07:03 PM
Joined: Apr 2012
Posts: 2,698
West Michigan
buck91 Offline
buck91  Offline
Joined: Apr 2012
Posts: 2,698
West Michigan
NO panther ever had a transaxle. As for LSD, I don't believe the MGM had that option but don't hold me to it.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: 2003 Grand Marquis differential oil change [Re: buck91] #4505894
09/02/17 10:15 PM
09/02/17 10:15 PM
Joined: May 2009
Posts: 2,304
WA (USA)
Y_K Offline
Y_K  Offline
Joined: May 2009
Posts: 2,304
WA (USA)
Rear axles were not hardened and the bearings have no inner races, so the rollers that sit on the axles chewed the soft ones up


"This forum talking about 4wd systems is like when other forums talk about oil."
Re: 2003 Grand Marquis differential oil change [Re: Y_K] #4506018
09/03/17 07:11 AM
09/03/17 07:11 AM
Joined: Mar 2008
Posts: 6,141
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,141
Michigan
Originally Posted By: Y_K
Wasn't 2003 the year of soft transaxle disaster on panthers? Heavy oil may help somewhat if it was.


The oil didn't look that bad when it came out. Maybe if it had axle issues that were repaired and oil was changed then


2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N

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