turns out the diff shipped w/the original oil still in it so i guess i'll wait a few thousand miles then before i change it out. came from hardtopguy w/7 miles so i'm pretty sure it's good. thanks.

 

Has anyone tried the BG 75w-140 full synthetic? I just scored a free combo pack with the 2 quarts of lube and LSD additive. Bad idea or did I hit the lube lotto?

Thanks!!

 

The 140 part of the viscosity is most likely too thick for our cars. If you track the car and don't mind doing some slow warm up laps, then go ahead. On the street you'd be hard pressed to get the fluid warmed up before you reach your destination.
Our diffs don't have clutch packs in the LSD, so "additives" are not necessary.

 

i asked about 140 and was told not to run it. ill just stick by that.

 

For 99% of S2000 owners, 75w90 is the way to go. Mobil 1, or LE-607 seem to be the brands of choice. I go with Mobil only because it's rated for use in our cold winter weather, where-as LE-607 is not.

Also, if concerned about your diff. performance, read xvipers how-to on doing a diff fluid change. I was fortunate enough to learn how to do it by watching him change mine in person, but I've now done 2 diff fluid changes all on my own and it's probably easier than changing the engine oil.

 

I use Motul 75W90 here in CA