Handy reading......just one of many examples on the net.
http://www.math.uwaterloo.ca/~rblander/oil_opinion.html
Suck to say, but you might find that the oil you topped up with has friction modifiers in it, thus clutch is slipping.
Wass da bottle say as far as ratings?
Not sure if you can fix this by flushing the oil or similar...let's hope so though!
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