The ratings of 18 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”).

Phillips 66 (PSX) earns a D this week, moving down from last week’s grade of C. Phillips 66 operates as an independent downstream energy company. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of PSX stock.

Tesoro Corporation (TSO) declines this week from a C to a D. 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 revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TSO stock.

This is a rough week for Western Gas Partners, LP (WES). The company’s rating falls to D from the previous week’s C. Western Gas Partners, LP operates, acquires, and develops midstream energy assets in east, west, and south Texas; the Rocky Mountains; and the Mid-Continent. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of WES stock.

Targa Resources Corp. (TRGP) gets weaker ratings this week as last week’s C drops to a D. Targa Resources Corp. provides midstream natural gas and natural gas liquid (NGL) services in the United States. The company also gets F’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of TRGP stock.

Western Gas Equity Partners LP (WGP) is having a tough week. The company’s rating falls from a C to a D. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of WGP stock.

Adams Resources & Energy, Inc.’s (AE) rating weakens this week, dropping to a D versus last week’s 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.

This week, Marathon Petroleum Corporation (MPC) drops from a D to a F rating. Marathon Petroleum Corporation is a supplier of gasoline and distillates to resellers and consumers. The company also gets F’s in sales growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of MPC stock.

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

Slipping from a C to a D rating, Sunoco Logistics Partners L.P. (SXL) takes a hit this week. Sunoco Logistics Partners L.P. is engaged in the business of transporting and storing refined products and crude oil, as well as the purchase and sale of crude oil. The company also gets F’s in sales growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SXL stock.

SM Energy Company (SM) experiences a ratings drop this week, going from last week’s C to a D. SM Energy Company is an independent energy company that explores, exploits, develops, acquires and produces natural gas and crude oil 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 SM stock.

This week, CrossAmerica Partners LP’s (CAPL) rating worsens to a D from the company’s C rating a week ago. The company also gets F’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of CAPL stock.

Crestwood Equity Partners LP (CEQP) is having a tough week. The company’s rating falls from a C to a D. Crestwood Equity Partners LP operates in natural gas storage in Texas, and in natural gas, liquid and crude oil services serving customers in the United States and Canada. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CEQP stock.

Earthstone Energy, Inc. (ESTE) slips from a D to a F this week. Earthstone Energy, Inc. is an independent oil and gas exploration and production company, primarily engages in the exploration, development, and production of oil and natural gas properties in the United States. The company also gets F’s in sales growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of ESTE stock.

Gener8 Maritime Inc (GNRT) declines this week from a D to a F. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of GNRT stock.

This week, Jones Energy, Inc. Class A (JONE) drops from a C to a D rating. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of JONE stock.

Clean Energy Fuels Corp. (CLNE) gets weaker ratings this week as last week’s C drops to a D. Clean Energy Fuels Corp. sells natural gas fueling solutions to its customers mainly in the United States and Canada. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of CLNE stock.

Southcross Energy Partners, L.P. (SXE) earns a D this week, moving down from last week’s grade of C. The company also gets F’s in sales growth, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SXE stock.

Legacy Reserves LP’s (LGCY) rating weakens this week, dropping to a D versus last week’s C. Legacy Reserves LP acquires and explores for oil and natural gas properties in the United States. The company also gets F’s in sales growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of LGCY 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.