I gave my bike a Germanic name (which is a diminutive nickname [fitting for a type 248] of a name that means "noble" or "of a noble sort") because it's a BMW and a female name because I do that with machinery that I have a romantic attitude towards... or some would go so far as to say share a relationship with. Â This is especially so on a machine that I own and therefore care for... and conversely the machine does its job (or cares) for me.
My 60's Ariens snowblower is a She... some worn out 3 year Troybilt with a Chinese motor on it is not.
I'd call my brother's old Ford Falcon a She, but not my roommate's VW Jetta.
Also, having studied Latin for 8 years, I'd like to point out that machina, machinae, whence we get "machine," is a first declension feminine noun.