This trade using only $672 of buying power and right now is trading with a $270 gain, closing now would give a very nice ROI and I would not consider wrong, I will however be holding for a bit long just to see what it can do. In the event you went with size greater than 1 closing half would be a prudent idea.
Alley, From the chart it looks like you bought the March contract and sold the Dec...? (CLM2018-CLZ2017) I would be curious what the buying power reduction is on this trade was and if there was any particular reason you selected March when oil has monthly contracts? I would guess liquidity in the front month starts drying up around some certain time, but not sure if oil is better/worse than other futures in general. Looking forward to see how you manage this and when you will add or adjust to this trade.