75w-140 gear oil RP or Mobil 1 - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 02-25-2012, 12:27 PM Thread Starter
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75w-140 gear oil RP or Mobil 1

just curious, going to replace mine this week with one or the other. Also anyone find a cheapER than normal place to buy these? i know they're more expensive than regular gear oil...

02 F250 7.3 Ext. Cab Long Bed
6637 DIY intake, muffler delete, EBPV delete, 6.0 cooler, ISSPRO gauges
285/75/16 BFG a/t's
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post #2 of 6 Old 02-25-2012, 02:22 PM
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Schaeffers
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post #3 of 6 Old 02-25-2012, 04:03 PM
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I used Royal Purple because I got it cheaper than the mobil. Seems to be pretty good stuff.

2001 F350 SRW CC 4WD LB
ZF6 w/ Southbend, 220k, DIY Intake, WW,NonEBPV Pedestal, CCV Mod, Gauges (Boost, Pyro), 2in Leveling Kit, 4" Straight MBRP, AIH Delete, 2-12" Kicker Comp's, Pioneer Amps
2001 F350 DRW EC 2WD (Rolled Over)
2000 F550 CC 2WD
Automatic, Jasper 4R100 w/Derale Pan & 6.0 Cooler, DIY Intake, AIH Delete, 4" MBRP,
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post #4 of 6 Old 02-26-2012, 08:21 AM
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I'd use a good synthetic with the appropriate friction modifier as required. Schaeffers is excellent.
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post #5 of 6 Old 02-26-2012, 01:55 PM
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If those are your only 2 choices? I would go with M1... Just My opinion!
But go with the one that is cheaper and at your closest Store... Prices will vary for everyone... Depending on your location...

Redline I feel has the most Robust Gear Oils... Followed by

Amsoil SVG & Schaeffers

01F250-4WD-XLT-AUTO-CC-7.3L-{295K} Miles
Donaldson AIS Intake System w/Zoodad
4''Turbo Back MBRP Exhaust
Remote Spin-on Coolant Filter/Red {ELC}&RMI-25
Remote Spin-on Transmission Filter/Lg Magnet
203*F T-Stat w/Billet Housing
CCV Re-route
SS HPX Line
Many Other Small Mods
---------------------------------------------------
Oil-------->T6 w/Amsoil Filter & Lg Magnet
AMSOIL-------->Every where else
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post #6 of 6 Old 02-26-2012, 03:44 PM Thread Starter
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ended up going with mobil 1..limited slip seems to be happy with just the oil and no additional additive...

02 F250 7.3 Ext. Cab Long Bed
6637 DIY intake, muffler delete, EBPV delete, 6.0 cooler, ISSPRO gauges
285/75/16 BFG a/t's
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