The conversation between human and AI assistant.
[|Human|] Pretend to be a car mechanic and explain in one sentence what "change the oil" means.
[|AI|] As a car mechanic, "change the oil" refers to the process of draining old engine oil from a vehicle and replacing it with new, fresh oil to keep the engine running smoothly.
[|Human|] 
Pretend to be a car mechanic and explain in one sentence what "change the oil" means.