Good Entry Point for Spread Trading

Spreading Trading -- Buyer Brent and Sell WTI Crude Oil:
Reason:
1. Most of the time Brent Crude Oil price higher than WTI Crude Oil Price.
2. Only around 1 months period that this spread is lower than 1.26 from Jan 2015 to now.
3. Normally, Recent Spread was kept around USD3 to USD3.5 per barrel