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If this were mine I would not throw an oil cooler at it. I'd drain the coolant, flush the system a couple times with distilled water, and then run it up to 185 degrees with distilled water only to see if the oil returns. You'll have to watch the temp as water does not cool as well as water coolant mixture. If the oil stays gone then you have the data point that it appears to be the last person contaminated the coolant. If it comes back. I'd remove the oil cooler and pressure test it with air before buying a new one.
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2003 S manual
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