OK, sounds like your coolant shouldn't be an issue. What brand of heat exchanger (oil cooler) did you use last time (any time) you replaced it? I see cheap aftermarket units for as low as USD$30 and BMW ones for USD$250...
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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