from one Newby to another. I too have a 2000S by the way. I would begin by insepcting the coolant cap as they tend to loose pressure. The last two digits of part number on the cap indicate the version used on your car. My original cap ended in 00 and I recently replaced it with the latest type which ends in 04. When the cap looses pressure you will have a coolant overflow in the right hand rear wheel. If there's no coolant present in the rear trunk / boot area under the carpet then you may well have solved your problem. If there's coolant present then your coolant reservoir tank may have developed a crack. I can't comment on the oil being present in your coolant since I've not run into that issue myself.
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