Question Differentials just changed with Mobile 1.. input?? - F-Series & SuperDuty Diesel Forums

brianjbeach85 · 10-16-2010, 07:36 PM

Guys i just changed the front and rear differentials with Mobile 1 fully synthetic with "LS" addative in them. front differential took about 3 quarts of 75w 90.. and rear took about 4-5 quarts of 75w 140. anyone have any input on if this was a good move? or bad.. i dont really "haul" much never more than a 15k load if that. just looking for LONGEVITY.. trying to make the truck solid from engine to drivetrain to body.. whole 9 so to speak lol. I am doing the transfer case tomorrow with mobile 1 synthetic ATF... anyone know allen key size for plugs on transfer case while i am at it??

WD40 · 10-17-2010, 01:55 AM

I think you will be fine. Synthetic run a little cooler.
Good Luck with them.
Doug

JLDickmon · 10-17-2010, 06:55 AM

don't try to extend the interval with synthetics.. it's just counterproductive.
take the better protection they give you and be happy.

JimmyDee · 10-17-2010, 02:27 PM

The rear end calls for synthetic. Probably because it works very hard and produces a ton of heat. For the other parts that you are changing, it will make them last a lot longer.
Jim

brianjbeach85 · 10-17-2010, 06:29 PM

all the fluids are fully synthetic so i will continue to change them at interval, just curious if anyone has any real world experience about longevity.. example would be having a 6.0L with like 350k on it and having no issues with differentials or transfer case while using synthetics u know?

Thanks for input guys.. and i got held up other day because i was missing the 3/8 allen.. friggin transfer case plugs gotta be different than differentials..*sigh* all done tho!

Crumm · 10-18-2010, 12:14 AM

I have been running Mobil 1 in my differentials for 14 years. I only have 80k miles so it will be a while before I know muck about longevity. I do know the truck rolls much better at -40 with the synthetic.

10-16-2010, 07:36 PM	#1
brianjbeach85 SDD Junior Member Join Date: Aug 2010 Location: Va Beach/VA/USA Posts: 39 Thanks: 1 Thanked 1 Time in 1 Post	Differentials just changed with Mobile 1.. input?? Guys i just changed the front and rear differentials with Mobile 1 fully synthetic with "LS" addative in them. front differential took about 3 quarts of 75w 90.. and rear took about 4-5 quarts of 75w 140. anyone have any input on if this was a good move? or bad.. i dont really "haul" much never more than a 15k load if that. just looking for LONGEVITY.. trying to make the truck solid from engine to drivetrain to body.. whole 9 so to speak lol. I am doing the transfer case tomorrow with mobile 1 synthetic ATF... anyone know allen key size for plugs on transfer case while i am at it?? __________________ 2005 F250 crew cab lariat 4x4 Mods: Predator 100RWHP 198lbs TQ Tune 5" MBRP Turbo back (with Kitty delete) 6" Tip ZooDad Mod S&B oil based Intake kit ReadyLift 2 1/5 inch leveling kit With 1 inch block in rear DieselSite Coolant Filter kit Dick Cepek DC2 12X18's With MT's Baja ATZ 35X13.50X18

10-17-2010, 01:55 AM	#2
WD40 SDD Senior Member Join Date: Aug 2005 Location: Benton Arkansas & McAllen Posts: 2,759 Thanks: 57 Thanked 111 Times in 107 Posts View Photos By: WD40	I think you will be fine. Synthetic run a little cooler. Good Luck with them. Doug __________________ 2006 Ford F-350 Crew Cab Lariat 4X2 PSD 6.0 TorqShift Automatic Transmission, MAG-HYTEC DIFF COVERS Bama ZooDad If you think the 6.0 is bad.....Get a 6.4 2004 35 ft Hitch Hiker 16589 EW. Doug Is it time to go camping yet?

10-17-2010, 06:55 AM	#3
JLDickmon ursus combibo Join Date: Jun 2006 Location: 49041 Posts: 3,796 Thanks: 37 Thanked 265 Times in 249 Posts View Photos By: JLDickmon	don't try to extend the interval with synthetics.. it's just counterproductive. take the better protection they give you and be happy. __________________ John '99 F250 7.3L auto 4wd CC/SB

10-17-2010, 02:27 PM	#4
JimmyDee God Bless America Join Date: Apr 2005 Location: Western Michigan Posts: 337 Thanks: 0 Thanked 6 Times in 4 Posts View Photos By: JimmyDee	The rear end calls for synthetic. Probably because it works very hard and produces a ton of heat. For the other parts that you are changing, it will make them last a lot longer. Jim __________________ 2001, F250 4x4, CC, Auto; Mobil 1 in transfer case&Trans.; Frantz Bypass Filter; "Hutch" fuel mods; Sonnax/Tricum mod; 4" Exhaust, 30" MagnaFlow; Attitude in A-Pillar and tranny gauge in Dash; AIS; EASE Diagnostics; Reese Slider Hitch; Fr Rotors, Cryo Treated&Slotted by ART.

10-17-2010, 06:29 PM	#5
brianjbeach85 SDD Junior Member Join Date: Aug 2010 Location: Va Beach/VA/USA Posts: 39 Thanks: 1 Thanked 1 Time in 1 Post	all the fluids are fully synthetic so i will continue to change them at interval, just curious if anyone has any real world experience about longevity.. example would be having a 6.0L with like 350k on it and having no issues with differentials or transfer case while using synthetics u know? Thanks for input guys.. and i got held up other day because i was missing the 3/8 allen.. friggin transfer case plugs gotta be different than differentials..sigh all done tho! __________________ 2005 F250 crew cab lariat 4x4 Mods: Predator 100RWHP 198lbs TQ Tune 5" MBRP Turbo back (with Kitty delete) 6" Tip ZooDad Mod S&B oil based Intake kit ReadyLift 2 1/5 inch leveling kit With 1 inch block in rear DieselSite Coolant Filter kit Dick Cepek DC2 12X18's With MT's Baja ATZ 35X13.50X18

10-18-2010, 12:14 AM	#6
Crumm Moderator/Fordoholic Join Date: Apr 2005 Location: Fairbanks, Alaska Posts: 5,623 Thanks: 16 Thanked 52 Times in 45 Posts View Photos By: Crumm	I have been running Mobil 1 in my differentials for 14 years. I only have 80k miles so it will be a while before I know muck about longevity. I do know the truck rolls much better at -40 with the synthetic. __________________ CRUMMY™ is a 1996 F350 Click for Specs & Pictures

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