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.
Front month is now may, but IB calls it april. Why I do not know. Crude contracts have weird expiration cycle, and IB always is one month behind. The mini contracts don't seem to have a lot of liquidity but I don't think they would get too far out of line with RTH, otherwise they would be arbed. Just keep an eye on pit prices and use limits.