Time to add petroleum refiners to watch list or buy now?

Due to US Commerce Department let two companies Pioneer Natural Resources and Enterprise Product Partners to export condensate to foreign market most other petroleum refiners are sinking today.

Valero(VLO) is down 9.56%

Western Refining (WNR) is down 7.48%

Marathon Petroleum (MPC ) is down 6.93%

Phillips 66 (PSX) is down 4.58%

Here some data for dividends investors.

Company	Price 6/25	52 weeks low/high	Dividend Yield	PE	Dividend payments
VLO	50.68	33/59.69	1.7	9.52	since 1998
WNR	37.66	25.62/45	2.5	13.19	since 2006 (no dividends in 2009, 2010, 2011)
PSX	81.11	54.8/87	2.3	12.68	since 2012
MPC	80.38	61/97	1.9	15.64	since 2011

Thestreet thinks that Valero is a BUY now. Read here.

Barrons believes that Valero (VLO) and Western Refining (WNR) are still good to buy. Read here

Out of refiners list I like VLO the most. What do you think? Is this time to add Refiners to watch list or to buy now?