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CRP Automotive now offers Rein Automotive Aluminum Stretch Bolts for BMW engine applications. These stretch bolts are designed as replacements for the "one time use" only fasteners used by BMW to mount components such as transmissions, oil pans, water pumps, power steering pumps, and alternators to their engine assemblies.

Rein Automotive Brand Manager Paul Swyter, explains, "BMW uses a magnesium-aluminum composite to make one of the world's lightest 3.0-liter gas engines. While this reduced weight improves performance, efficiency, and overall block strength, it comes at a price. The magnesium in the block can cause electrochemical corrosion from contact with other materials such as iron. As a result, steel bolts cannot be used in engine assembly and BMW has specified the use of specially designed aluminum stretch bolts." Swyter also notes, "However, to ensure proper fastening these bolts are designed for 'one-time-use' only. Reusing them or using the wrong bolts can result in improper torqueing, loosening, breakage, or thread damage in the block."