For stashers, it depends on how soon you plan on using it. I try to use older stuff first. About 5 years ago, I bought a 34q load of SJ Superflo Semi-Syn for $.01c a quart. I'd still use it. I have M02 GC in my new car now and SL Havoline Synth on-deck. I think the rule could be that better oil lasts lobnger, even on the shelf and is much more appropriate to use after the made-date.