Reason? Just breakin. Prolly not needed but I'm kinda anal about such things. Plus I found the shell spirax brand which is mil-spec at $5 qt.
http://www.epc.shell.com/Docs/GPCDOC_GTDS_Shell_Spirax_S2_G_80W-90_(en)_TDS_v1.pdf
http://www.epc.shell.com/Docs/GPCDOC_GTDS_Shell_Spirax_S2_G_80W-90_(en)_TDS_v1.pdf
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