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S100 Engine Brightener: Got a bike with a black engine that just isnít so black anymore? Bikers like you told us they needed special help in this area and we listened! Our S100 Engine Brightener can take a tired, greyed-out engine and make it look almost factory-new again! Just clean the engine and dry, then spray on our temperature stable S100 Engine Brightener. Use the handy misting spray nozzle (an industry exclusive) to get into the cooling fins and crannies without over-applying. That factory black look comes back and lasts for miles and miles and holds up to a bunch of washes, too. Friends will think you replaced the engine!