I have noticed that when I start my car, the first 20-30 seconds I hear
what seems to be value tap or cam noise.  It only does this after it has
been sitting over night or many hours.  

The noise goes away completely in less than a minute after starting.  I
recently added a bottle of Lucas oil additive to try and solve that cold
starting noise, but it is still there.

I need to do an oil change soon, so wondering if I should go 30w5 or 30w10,
or if any of that even makes a difference concerning this.

Something to be concerned about or not?  

Thanks.

- Mark
  
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