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Just a wild theory, do you know if the car coolant gets up to working temp fairly quickly, as something like a thermostat stuck (open) will cause it to spend most of its time running cooler and possibly will not help with oil consumption (which the petrol C30s do seem to suffer from), try plugging in a cheap obd2 reader and monitor coolant temp on a typical run, it should reach 90c (although the dash gauge doesnt really work like a linear readout).
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