Hi Folks, I am wrapping up getting my 2007 Nismo all fluidly pleased. So I put in the new radiator to prevent SMOD. This weekend I plan to change oil, drain and fill tranny and then drain and fill the rear differential. Because this has the locking rear differential, I am wondering if any of the steps to change it differ. Also what is the full synthetic that best replicates Nissan’s brand…I assume Castrol. Also what weight is best. I appreciate any experience, strength and hope in this endeavor. Also I am open to any other suggestions on how to give my Nismo a good fresh start at 93K. I have changed both the Air and the cabin Air filters.