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

This week, Western Refining, Inc. (WNR) drops from a D to a F rating. Western Refining, Inc. is an independent crude oil refiner and marketer of refined products and also operates service stations and convenience stores. The company also gets F’s in sales growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of WNR stock.

This is a rough week for Teekay LNG Partners L.P. (TGP). The company’s rating falls to F from the previous week’s D. Teekay LNG Partners L.P. provides marine transportation services for liquefied natural gas, liquefied petroleum gas and crude oil. The company also gets F’s in earnings growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of TGP stock.

Petroleo Brasileiro SA Sponsored ADR (PBR) declines this week from a C to a D. Petroleo Brasileiro SA Sponsored ADR explores for and produces oil and natural gas. The company also gets F’s in sales growth, operating margin growth, earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PBR stock.

GeoPark Ltd (GPRK) slips from a D to a F this week. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GPRK stock.

Navios Maritime Acquisition Corporation (NNA) earns a F this week, moving down from last week’s grade of D. Navios Maritime Acquisition Corporation is an owner and operator of tanker vessels focusing in the transportation of petroleum products (clean and dirty) and bulk liquid chemicals. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of NNA 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.