Yours truly has a neutral opinion regarding engine flushes: I believe engine flushes are only necessary when the engine has sludge buildup. Sludge is a dark and thick substance from contaminated oil, accumulating inside the engine over time. Sludge causes poor oil circulation when left unchecked, and it opens the doors to more problems like mediocre fuel economy, lackluster performance, more engine noise, and poor emissions. Avoiding the formation of sludge is the main reason why skipping oil changes
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