3M MMM-8962 Intake System Cleaner Kit - Professional-Grade Engine Cleaning Solution The 3M Intake System Cleaner Kit (MMM-8962) is a professional-grade product designed to remove harmful deposits from a vehicle's intake system. These harmful deposits, including carbon and soot, can hinder engine performance, leading to reduced fuel economy and engine knocking issues. Regular use of the 3M Intake System Cleaner Kit helps maintain optimal engine performance and improves fuel efficiency.