New exhaust parts are painted to help stop corrosion I assume and it is this coating that burns off when new. Both or our new minis smelt of burning for the first 500 miles or so.
Hot coolant smells different from new exhaust smell. An engine can loose coolant from external pipes, coolant tank or anywhere else in the system. If an engine looses coolant internally it can mix with engine oil and can form as a maio cream like substance in the coolant tank. Sent from my iPhone using AutoGuide.com App