Quote from AAAintheBeltway:
Just a followup. I noticed today that the QM May contract, what IB for some reason calls "April", was very thin with wide spreads at times and last trade was often far off the pit price. Be careful out there.
I also looked into emini ny crude, I believe its symbol is QM with April being the front month. The spreads are usually just very inconsistent to make it a viable mkt for even long term trading.