4 Oil Gas & Consumable Fuels stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Diamondback Energy, Inc.’s (FANG) ratings are looking better this week, moving up to a B from last week’s C. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of FANG stock.

Valero Energy Partners LP (VLP) improves from a B to a A rating this week. The company also gets A’s in sales growth, operating margin growth, earnings growth, and return on equity. For more information, get Portfolio Grader’s complete analysis of VLP stock.

Petrobras Argentina SA Sponsored ADR Class B (PZE) is seeing ratings go up from a C last week to a B this week. Petrobras Argentina SA Sponsored ADR Class B explores for, produces, refines, and transports oil and natural gas in South America. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of PZE stock.

This is a strong week for Sandridge Mississippian Trust I (SDT). The company’s rating climbs to B from the previous week’s C. Sandridge Mississippian Trust I a statutory trust, engages in the acquisition and holding of royalty interests in specified oil and natural gas properties located in the United States. For more information, get Portfolio Grader’s complete analysis of SDT 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.