Robin Ream wrote:

 Hello Paul,

     I know this is a rotary engine forum, but I've got what I think is a

simple car question you can probably answer very easily.  I'm installing an
Auburn limited slip differential in a two wheel

 drive pick-up and the manufacturers recommendation is to use a

proprietary additive with heavy weight petroleum oil rather than an over the
counter heavy weight synthetic.  The question:  Are they

 trying to insure repeat sales of both additive and differentials, or is

the synthetic oil really not good to use in the limited slip differential?
It looks to me like they're trying to approximate

 the quality of the synthetic by using the additive, but as Dennis Miller

says "That's just my opinion; I could be wrong."  :-)

 Thanks,
 Robin

Robin,

as far as I understand this, synthetics are too "slippery" for the "limited"
part of the differential, essentially not providing enough friction between
the friction plates. I am sure they could build a limited slip d. for
synthetics if they could ensure that every customer uses the correct oil. If
built for synthetics and used with regular oil, the limiting action may be
to harsh and you can get driveability issues ( and or liability issues....).

I suggest to use a g-rotor typ limited or torsen-typ limited if they exist
for your application.........

Thomas Jakits

David Arbogast wrote:

My excursion diesel limited slip and F-250 SD I had with limited slip both had synthetic lub in the differential. Ford has a "friction additive" that is added to the 80w90. It smells funny. The lube
is still synthetic, so I think it retains the high temp qualities...

 
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