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See I would disagree. Firstly I would look if there was a spec of oil and then match the rating as 0w is very thin (third thinner at 40c) and be an issue on some engines.
Edit quick google gives c30 spec and a40 spec and gives two differing grades so http://www.mobil1.co.uk/which-synthetic-engine-oil/porsche-engine-oil.aspx then the a40 spec is http://www.porscheownersmanuals.com/en/2/190/
lynx
no reason not to IMO - the 0w vs 5w is only really relates to viscosity when cold, if anything 0w will give you better cold start protection
the weight of both oils is the same at operating temperature, so should be fine.