The ratings of 5 Oil Gas & Consumable Fuels stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Tesoro Corporation (TSO) drops from a D to a F rating. Tesoro Corporation is an independent company that refines crude oil, sells refined products in bulk and sells motor fuels on the retail market. The company also gets F’s in sales growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TSO stock.

Sunoco LP (SUN) gets weaker ratings this week as last week’s D drops to a F. Sunoco LP is a petroleum refiner and marketer, as well as a manufacturer of chemicals. The company also gets F’s in sales growth, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SUN stock.

Western Refining Logistics, LP (WNRL) declines this week from a C to a D. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of WNRL stock.

Teekay Offshore Partners L.P. (TOO) experiences a ratings drop this week, going from last week’s D to a F. Teekay Offshore Partners L.P. provides marine transportation and storage services to the offshore oil industry. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TOO stock.

Slipping from a C to a D rating, SandRidge Mississippian Trust II (SDR) takes a hit this week. SandRidge Mississippian Trust II owns oil and natural gas wells and is based in Austin, Texas. For more information, get Portfolio Grader’s complete analysis of SDR stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.