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There has to be ONE answer for this... let's give it a try.
The Eaton (aka automatic locking differential) units in 900 series cars and some others, need GL-5 oil. 80w90. Simple.
The question is, do they need actual limited slip additive (friction modifier)?
Eaton says yes; Volvo doesn't say anything about it. To muddy the waters further, the 4x4 message boards I look at usually say "yes" to the Eaton Locker for friction modifier, but they say "no" if you are using Redline or Mobil or Amsoil (one of the ones that has the stuff already added, apparently). Some of these guys are REALLY knowledgeable about product, especially GM with that particular unit--almost the same as Volvo has.
The Eaton unit apparently does have some sort of clutches, although not to the extent of a LSD. The Eatons lock up differently and perhaps don't need the degree of added slip to prevent harsh engagement and perhaps extend life expectancy.
So... which is it? Anyone have the answer? I've never used the friction modifier in my own cars... but that doesn't mean it shouldn't be there. In low torque/horsepower applications like the B230F or B230FT (compared to V8 power), it might not really make any difference. Chatter is a little evident from some of these units, but not so much so that you'd think to add the modifier.
I suppose knowing how they were shipped from the factory would shed light on that... if anyone happens to know.
Of course, ALL input is appreciated...
--
1992 940 wagon, very low miles
as well as others.
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