I have a April 2001 999cc lupo E. Variant SCAUCX01, and i am experiencing some odd gearbox noises. I had thought that the general transmission oil also served the gear box but i am reading that there is separate gearbox oil and that may either need topping up or renewing? Any thoughts? Also do I need a 17mm hex plug / Allen Key as is suggested by other topics to top up and/or drain? Do you know where the top up and drain plugs are? Any pics? Thanks