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S100 Engine Brightener can take a tired, grayed-out engine and make it look almost factory-new again. Just clean the engine and dry, then spray-on S100 Engine Brightener. Use the handy misting spray nozzle 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. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.





