As expected, Oil had a meaningful selloff after breaking support around the $51 level on March 8th. This level had been support from early December throughout then. There is support at this level because it had been a resistance level in June and then again in October of last year. It was also resistance and a turning point in October of 2015.
There doesn't seem to be meaningful support until it approaches the $43 level. This was where it found a bottom and rallied in September and again in November.