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Old 07-22-2001, 11:26 AM
bandlow bandlow is offline
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Differential Lube

1995 Explorer 4D4WD, conventional rear end, Axle Code 45. I'm preparing to
change the differential lube at 100,000 miles.

I have a Shop Manual which is causing me some confusion. In the servicing
section (00-03-30) it specifies XY-90-QL, Ford Spec ESP-M2C-154-A. I believe
that is a synthetic oil.

In the maintenance section (05-02C-9; 05-02B-43), it specifies XY-80W90-QL,
Ford Spec WSP-M2C-197-A. I think that is petroleum based.

I would prefer to use the same type and have heard stories of rear end
damage from mixing/changing lube types.

Does anyone know if or when Ford went to synthetic gear oil?


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Old 07-22-2001, 06:48 PM
jim henderson jim henderson is offline
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Differential Lube

I don't know the answer to your question but I have changed from whatever was in the diff from the factory to synthetic in my 94 F250 4x4 and a 96 Chebby SS. Both vehicles have performed fine since the change and have at least 20,000 miles since the switch over.

Experience from the SS list has shown that if a synthetic is used, you should use more of the limited slip additive than you would for dino based.

On my SS, the rear differential chatters far less than it did with the factory oil.

This is my experience, but since failure can take maybe 100K miles, who would know if the change to syn caused failure. At least I can say in 20K + there is no sign of any problem and in one car performance seemed improved.

Good Luck,

Jim Henderson
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Old 07-22-2001, 09:07 PM
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thelonerangerxlt thelonerangerxlt is offline
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Differential Lube

I think synthetic is recommended for heavy duty usage, such as towing. Synthetic is compatable with mineral, so I wouldn't worry about putting it in, even if it had mineral in it to start with. If it were mine, I would use a synthetic 75W-90.
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Old 07-23-2001, 10:17 AM
greenpus greenpus is offline
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Differential Lube

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Old 07-23-2001, 10:17 AM
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