Moily in LSD?

[ganderite]

I just bought my brother’s 93 Path SE. Has about 130,000 miles on it. No rust.

As part of my standard service when putting a used car on the road, I changed the fluids. All came out looking new. My brother says he had the car serviced by his Nissan dealer. They did a good job.

I usually squirt some moly (molybdenum disulphide) in manual transmissions. On some cars it made the transmission run much cooler and smoother to shift. I asked the mechanic to add it to the transmission and the differential. But when car was jacked up I tested and found the diff was a LSD, so I asked him not to add the moly to the diff. We put 3 quarts of Penzoil Synthetic 75-140 in the LSD.

Well, something went wrong and he added the moly, too. Now the back end is jerking as if the diff is locked. It was not doing this before. Can the two events be linked?

Is Penzoil Synthetic gear oil the correct lube for the factory LSD? Is it OK to add some moly to this?

I was surprised whern gear oil drained from the diff. My other cars use auto trans fluid in the LSD.
Modified by ganderite at 12:18 PM 11/26/2007

[fueler]

I used penzoil 80W-90 regular in my diffs, no additives. No problems. But i have a 99, no LSD, so slightly different than yours.

[ganderite]

I assume that LSD is VERY differernt lube requirement than an open diff.

But, that said, I saw what looked like regular gear oil drain out of it.

[fueler]

Pennzoil gear oil is approved for use in LSD. At the Nissan dealership, they use the same 80w-90 Pennzoil for both LSD and non-LSD differentials - but again, I am speaking about 96-04 pathfinders.