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Eureka! I've unearthed a 6qt case of Castrol Syntec 5W-50, from ~1989 (pre-synth wars, it was intended for my '82 race fbody). There are no visible date codes on the bottles or box. It's API SH/CD, CCMC, G-4, G-5, PD2, and JASO. ILSAC GF-1. GM 4718M.
Should I:
a) Use it.
b) Get a virgin analysis first.
c) Auction it on ebay.
David