The overall ratings of 16 Oil Gas & Consumable Fuels stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

EOG Resources, Inc.’s (EOG) rating weakens this week, dropping to a D versus last week’s C. EOG Resources, Inc. is in the business of the exploration, development, production, and marketing of natural gas and crude oil. The company also gets F’s in sales growth, operating margin growth, earnings revisions, and return on equity. For more information, get Portfolio Grader’s complete analysis of EOG stock.

This week, Carrizo Oil & Gas, Inc.’s (CRZO) rating worsens to a D from the company’s C rating a week ago. Carrizo Oil & Gas, Inc. is engaged in the exploration, development, production and transportation of natural gas and oil, mainly in the United States. The company also gets F’s in sales growth, operating margin growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CRZO stock.

Adams Resources & Energy, Inc. (AE) earns a D this week, moving down from last week’s grade of C. Adams Resources & Energy, Inc. engages in marketing crude oil, natural gas, and petroleum products. The company also gets F’s in sales growth and operating margin growth. For more information, get Portfolio Grader’s complete analysis of AE stock.

Shell Midstream Partners LP (SHLX) is having a tough week. The company’s rating falls from a C to a D. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of SHLX stock.

This week, NuStar GP Holdings, LLC (NSH) drops from a C to a D rating. NuStar GP Holdings, LLC operates oil pipelines, terminals, and storage facilities. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of NSH stock.

Matador Resources Company (MTDR) slips from a C to a D this week. Matador Resources Company engages in the exploration, development, production, and acquisition of oil and natural gas resources in the United States. The company also gets F’s in sales growth, operating margin growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MTDR stock.

Enbridge Energy Partners, L.P. Class A (EEP) gets weaker ratings this week as last week’s D drops to a F. Enbridge Energy Partners, L.P. Class A transports crude oil and natural gas liquids to refineries in the midwestern United States and eastern Canada. The company also gets F’s in sales growth, earnings growth, and free cash flow. For more information, get Portfolio Grader’s complete analysis of EEP stock.

Slipping from a D to a F rating, Teekay LNG Partners L.P. (TGP) takes a hit this week. 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, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TGP stock.

This is a rough week for Renewable Energy Group, Inc. (REGI). The company’s rating falls to D from the previous week’s C. Renewable Energy Group, Inc. engages in the production, marketing and distribution of biodiesel and its co-products in the United States. The company also gets F’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of REGI stock.

Petrobras Argentina SA Sponsored ADR Class B (PZE) experiences a ratings drop this week, going from last week’s C to a D. Petrobras Argentina SA Sponsored ADR Class B explores for, produces, refines, and transports oil and natural gas in South America. The company also gets F’s in sales growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PZE stock.

Scorpio Tankers Inc. (STNG) declines this week from a D to a F. Scorpio Tankers Inc. provides seaborne transportation of crude oil and other petroleum products worldwide. The company also gets F’s in earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of STNG stock.

Evolution Petroleum Corporation’s (EPM) rating weakens this week, dropping to a D versus last week’s C. Evolution Petroleum Corporation explores for and produces oil and gas. The company also gets F’s in sales growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of EPM stock.

Blueknight Energy Partners, L.P. (BKEP) slips from a D to a F this week. Blueknight Energy Partners, L.P. provides integrated terminalling, storage, processing, gathering, and transportation services for companies engaged in the production, distribution, and marketing of crude oil and asphalt products in the United States. The company also gets F’s in operating margin growth, earnings revisions, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of BKEP stock.

This week, StealthGas Inc. (GASS) drops from a D to a F rating. StealthGas Inc. offers marine transport services for liquefied petroleum gas producers and users. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GASS stock.

This week, Teekay Tankers Ltd. Class A’s (TNK) rating worsens to a F from the company’s D rating a week ago. Teekay Tankers Ltd. Class A owns oil tankers and transports crude oil. The company also gets F’s in earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TNK stock.

Zion Oil and Gas, Inc. (ZN) experiences a ratings drop this week, going from last week’s C to a D. Zion Oil and Gas, Inc. operates as a development stage oil and gas exploration company in Israel. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of ZN 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.