Lewis,
You are correct it does not contain water but WD-40 isn't actually a true lubricant either. It's main use is as a solvent or rust dissolver and it is hygoscopic. I would still recommend a lightweight oil.
But the best advice that David could use would be to consult a mechanic, but I do like the idea of someone taking it for a quiet drive once a month and topping up the fuel, it goes of quite quickly and EFI systems are more sensitive than carburettors.
Greg.
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