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Message: <blockquote data-quote="fabianyee" data-source="post: 649083" data-attributes="member: 6">Bear in mind many who had sludge issues going long term may not want to reveal the problem fearing resale issue. However, those who have visited workshops and seen how bad are some engines with sludge problem will think twice about extended oil service interval. If, unfortunately, your engine developed sludge problem few years down the line, I'm not the one with the headache, you are, that is if you still driving it. If you have sold the car, the headache would be the next owner's. Bear in mind, sludge problem doesn't develop overnight, it's a long process. It's accumulation of sediments inside the engine.</blockquote>