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So you bought that 240D brand new, it had no stretch at 380k, and currently has 533k on it...? Wow. And oddly enough extending synthetic drain intervals seems to have no detrimental effect on chain life. Isn't that what the filter is for? The only thing that should stay in the oil is soot, where it's suspended (assuming you change before hitting the 3-4% suspension limit for most diesel oils.)
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