I don't know about that...
I'm using Mobil Delvac1 5w40 in my Subaru and changing the oil every 10k or so. I'll be changing the filter at 5k and sending an oil sample out for analysis just to make sure everything is fine and dandy.
Just think... use a good quality oil, Mobil 1 or the like, and a bypass setup with submicronic depth filter, and you'll never have to change your oil again. Just the filters, and add oil as necessary due to leakage, or burn, but also to freshen up the additive packets.
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