Potential answers for "Sound of a smooth-running engine"

⭐⭐⭐⭐ PURR
⭐⭐⭐ OILED
⭐⭐⭐ HASSLEFREE
⭐⭐⭐ LUBED
⭐⭐⭐ PURRS
⭐⭐⭐ HUM

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