The ratings of 10 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”).

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

Summit Midstream Partners LP (SMLP) slips from a C to a D this week. The company also gets F’s in earnings revisions, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SMLP stock.

This week, Panhandle Oil and Gas Inc. Class A (PHX) drops from a C to a D rating. Panhandle Oil and Gas Inc. Class A explores for and develops oil and gas properties, and produces and sells oil and natural gas. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PHX stock.

Alon USA Partners LP (ALDW) earns a F this week, moving down from last week’s grade of D. The company also gets F’s in sales growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of ALDW stock.

This week, DHT Holdings, Inc.’s (DHT) rating worsens to a D from the company’s C rating a week ago. DHT Holdings, Inc. is an operator of a fleet of double-hull tankers. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of DHT stock.

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

Chesapeake Energy Corporation (CHK) gets weaker ratings this week as last week’s C drops to a D. Chesapeake Energy Corporation explores, develops and acquires properties for the production of natural gas and crude oil from underground reservoirs. The company also gets F’s in sales growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of CHK stock.

Teekay Tankers Ltd. Class A (TNK) experiences a ratings drop this week, going from last week’s D to a F. 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.

This is a rough week for Erin Energy Corporation (ERN). The company’s rating falls to F from the previous week’s D. 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 ERN stock.

Zion Oil and Gas, Inc.’s (ZN) rating weakens this week, dropping to a D versus last week’s C. 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.