WD 40 is perfectly fine to use on the chain. I`ve used WD 40 many times. A bicycle chain isn`t some complex machine and doesn`t require any special overpriced lubricants...Special chain maintenance is pointless, here in my area all it takes is one ride on snowy salt covered roads an your expensive lube is all going to get washed out and your chain will get all dirty. WD 40 is perfect for daily touch up to keep the chain running smoothly.