The grades of four auto parts stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Dorman Products, Inc. (DORM) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. 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.

China Automotive Systems, Inc. (CAAS) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. China Automotive System designs, markets, and sells custom-designed stained glass and leaded glass artifacts. Shares of the stock have been trading at an exceptionally rapid pace, up 983.7% from the week prior. For more information, get Portfolio Grader’s complete analysis of CAAS stock.

BorgWarner’s (BWA) ratings are looking better this week, moving up to an A from last week’s B. 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.

Federal-Mogul Holdings Corp (FDML) is seeing ratings go up from a C last week to a B this week. 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.