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I often think about a flush too on my kid's 4 runner. Only because it has 200k on it but the oil is still gold in color after 5000k oil change. I am just anal about sludge in any of my engines.
I think it would make sense to let gravity do all the work instead of sucking it through a small tube. Do the same, dran from the bottom on the next oil change just to get rid of all of the engine flush. After that, extract the oil through the cap as they oil will be clean of sludge.
May I ask why do you think it needs a flush?
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