Crossword clues for Runs smoothly, as an engine 4 letters:PURRSmooth-running engine soundHUMSRuns smoothly, as an enginePURRRun smoothly, as an engineLUBEDLike smooth-running enginesPURRSRuns smoothly, as an engineHUMRun smoothly, as an enginePURRLIKEAKITTENRun smoothly, as an enginePURRSRuns smoothly, like an engine
