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post #1 of 6 Old 01-26-2009, 04:34 AM Thread Starter
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Diff oil change

Does anyone see a reason why I can't put 75W-140 Mobile 1 in my front diff? Ford recc. 80W-90 but I am putting on a set of diff covers and only wanted to have to buy one oil. The rear is going to take just over 6qt's and the front is going to take 4.5qts so I was just wondering if I could pick a case up. Let me know if the thicker oil is going to cause something...

'07 CC S/B Black by chrome XLT, Cab rack and UWS toolbox(s) and a Rhino in the bed. MBRP S/S 4" dual kit. Banks cold air intake. Zoodad mod. SCT touch screen, Banks intercooler w/ highram. Mag-Hytec diff covers front and rear and tranny. EGR delete. BDS dual steering stabilizer Toyo A/T's 285x75R18 4.5 D/R lift... Warn transformer w/ 9.5k winch

'99 5.0 Xplorer w/ 32" silent armors, TM headers, MAC intake, Dynomax exhaust with 234,xxx miles.
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post #2 of 6 Old 01-26-2009, 05:02 AM
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I put 75w-140 Amsoil in both of my diffs and it has been fine.
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post #3 of 6 Old 01-26-2009, 03:30 PM
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I was just thinking this same thing. Im going to be doing diff covers soon and i wanted to buy a case of 75w140. I dont use 4wd that much but when i do i dont want to screw anything up by using the wrong fluid.

'02 F250 PSD XLT CC
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post #4 of 6 Old 01-27-2009, 05:37 AM
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Anyone else got input?

'02 F250 PSD XLT CC
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post #5 of 6 Old 01-27-2009, 05:40 AM
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I have amsoil severe gear in both diffs. No issues here.

2001 excursion 4x4, 4" Magnaflow SS exhaust, AEM Brute Force intake, 05 conversion, 6k HID's, after market tail lights, and thats it for now. More to come..

Maine Turbo Diesels

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post #6 of 6 Old 01-28-2009, 06:37 AM Thread Starter
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I went and bought oil yesterday and found out that the 75W-90 Mobile 1 was about half the price of the 75W-140 so I am going to put the "cheap" stuff in the front axle and then put the 75W-140 in the rear. It was $9 for a quart of Mobile 1 LS 75W-90 and $16 for the Mobile 1 LS 75W-140

'07 CC S/B Black by chrome XLT, Cab rack and UWS toolbox(s) and a Rhino in the bed. MBRP S/S 4" dual kit. Banks cold air intake. Zoodad mod. SCT touch screen, Banks intercooler w/ highram. Mag-Hytec diff covers front and rear and tranny. EGR delete. BDS dual steering stabilizer Toyo A/T's 285x75R18 4.5 D/R lift... Warn transformer w/ 9.5k winch

'99 5.0 Xplorer w/ 32" silent armors, TM headers, MAC intake, Dynomax exhaust with 234,xxx miles.
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