Ok so after sitting for about 2 months due to COVID drive the Smart for the fist time and noticed a oil smell. Opened the compartments and checked everything and no leaks. But when checking the coolant it was grayish.. I know usually that is a bad sign but anything special different or i should know about the Smart?? About 186k (2010 Fortwo) mostly highway. No issues starting or misfires at all.. Hoping its just a head gasket. Thoughts?