I do chemical compatibility stuff against O-rings and hoses all the time at work. WD40 wouldn't be my first choice as in theory it has stuff in it that isn't nice, but lets face it, unless you never ride the chain will wear. WD40 will not instantly cause your chain to disolve, your bits to fall off or the world to end. The chatroom theorists may worry but I wouldn't.
The chain manufacturers exclusion always looks to me like it was written by warranty people. If you exclude something detectable but generally done you cut down how much work you have to do: "So, you WD40'd the chain/rode out of the showroom on the BMW/tried to use the pump to move liquid Sir? Sorry, if you read clause 11b/12-iv you'll see that invalidates the warranty. Hard chips, buy a new one".
Andy
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