Hope it turns out in your favour mate.
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For what it's worth I've topped up diffs with slightly different grades when I've been caught out & left it in , only ever done it in an engine once under similar circumstances to you the other weekend but it was drained & replaced when we got home . In my opinion oil is cheap - engines ain't , you're running high psi turbo & the whole engine is tuned right up - for the sake of $100 worth of oil I'd piss it off & start again .