I bought this for my wife's Lexus. I've been using it on my tundra for 20 years. They always seem to have some gray (metal) sludge in them, so they definitely work. I also use magnets on my Tundra oil filter (20 years old) and they still pick up metal that needs to be wiped clean with a paper towel. The purer the oil, the better. Dirt is the engine's enemy.
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