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Sierra LSD Diff Oil ?
Kosmo - 3/3/07 at 08:57 PM

I'm about to clean up my diff and install new seals and get it all ready before my chassis arrives .... I was thinking of changing the diff oil, is this recomended and if so what type should I use or should I leave it alone ?

The diff is a 7" 4x4 lsd type (3:62)

Cheers,
Kosmo.

miegru - 3/3/07 at 09:17 PM

When I filled mine I talked to BGH gearboxes and they reccomended to use the standard ford oil.

graememk - 3/3/07 at 09:18 PM

the lsd is sealed so use normal oil.

Kosmo - 3/3/07 at 09:53 PM

quote:
Originally posted by graememk
the lsd is sealed so use normal oil.


What do you mean normal oil....?

Thanks
Kosmo.

the_fbi - 3/3/07 at 10:52 PM

quote:
Originally posted by Kosmo
quote:
Originally posted by graememk
the lsd is sealed so use normal oil.


What do you mean normal oil....?

Thanks
Kosmo.

Normal diff oil.

Chippy - 3/3/07 at 11:53 PM

It is "I think" EP 90, if not its EP 80. Think either would do, and as the diff is probably worn a bit I would go for the EP90. HTH Ray

blueshift - 4/3/07 at 11:15 AM

I have the haynes manual, it specifies one kind of oil for both open and LSD:

"Hypoid gear oil, viscosity SAE 90 to API GL5 (Duckhams Hypoid 90S)"

Kosmo - 4/3/07 at 06:01 PM

Cheers guys... thats the info I need

Dave Bailey - 4/3/07 at 09:44 PM

Ford still sell it and it's not expensive! Can't remember what it was though!

blakep82 - 5/3/07 at 09:14 PM

I've got a BMW with LSD, and i wouldn't put standard diff oil in it... always LSD oil. usually about £10 per litre. you can get it from rally design easy enough

the_fbi - 5/3/07 at 09:18 PM

quote:
Originally posted by blakep82
I've got a BMW with LSD, and i wouldn't put standard diff oil in it... always LSD oil. usually about £10 per litre. you can get it from rally design easy enough

But your BMW has a totally different type of LSD so it needs LSD oil

The Sierra diffs are sealed and contain their own LSD oil which isn't replaced/changed. Just normal diff oil needed for the CWP.