looked at an '02  slk320 my friend wants to buy ...  cold engine... start it..
  
very loud and noticeable 'ticking' noise from one side of engine. revving it.. got a bit quieter... at one point went away...
  
didnt drive car but idled it until warmer... and noise still present.. temp... 32F or so..
  
worst case - what could this be? valve issue?
  
best case -??
very loud and noticeable 'ticking' noise from one side of engine. revving it.. got a bit quieter... at one point went away...
didnt drive car but idled it until warmer... and noise still present.. temp... 32F or so..
worst case - what could this be? valve issue?
best case -??
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