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How we researched this guide The gasoline-engine companion to our pillar guide to the top engine flush products for cars: we compared 11 gasoline-rated crankcase flushes for US cars and light trucks, then read the maker data sheets for the 7 that publish them, including Liqui Moly’s Flush Plus sheet, Sea Foam’s HOW2 and BG’s
How we researched this guide We compared six crankcase cleaning products across three different methods — short-idle detergent flushes, a ring-focused restoration treatment, and a slow drive-in petroleum cleaner — and checked every product against its maker documents: Liqui Moly product and technical sheets, BG EPR flyers and BG Ireland engine pages, the official Sea