This week, four auto parts stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This week, Dorman Products, Inc. (DORM) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Dorman Products supplies automotive replacement parts, fasteners, and service line products primarily for the automotive aftermarket. In Portfolio Grader’s specific subcategory of Equity, DORM also gets an A. For more information, get Portfolio Grader’s complete analysis of DORM stock.

This week, China Automotive Systems, Inc. (CAAS) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). China Automotive System designs, markets, and sells custom-designed stained glass and leaded glass artifacts. For more information, get Portfolio Grader’s complete analysis of CAAS stock.

BorgWarner (BWA) is seeing ratings go up from a B last week to an A this week. BorgWarner is a supplier of highly engineered systems and components, mainly for powertrain applications. For more information, get Portfolio Grader’s complete analysis of BWA stock.

This week, Federal-Mogul Holdings Corp’s (FDML) ratings are up from a C last week to a B. Federal-Mogul supplies products, services and solutions to automotive, light commercial, heavy-duty truck, off-highway, agricultural, marine, rail, and industrial markets. For more information, get Portfolio Grader’s complete analysis of FDML 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.