Motor and engine are interchangeable in standard English — an engine takes energy in one form and performs mechanical work.With a BEV, no engine so infinite engine life.
If you see “engine” as synonymous with internal combustion engine, then yes, the Bolt doesn't have one of those, and you may feel more comfortable saying the Bolt has a motor. But interestingly, the same used to be true of internal combustion engines, because when they first appeared, “engine” was synonymous with steam engine, and so people called them motors, and hence “motor vehicles”.
But even if you think “electric engine” sounds weird compared to “electric motor”, the Bolt's electric motor serves as its propulsion engine. And this propulsion engine even has oil, an oil pump, and a cooling system. It even has a radiator! You may not ever need to change the oil in your Bolt, but there is oil in there all the same.