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Your engine is broken in. I would go with a 5-30w synthetic, may it be Mobile One, or .... It will still flow like the 5-20 when cold, but you will have the added wear protection of a 30w.

When I get between 3500-4000 miles on her, I will be switching to Mobile One. :smile:
 

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4995,

5W30 is rated at 5 viscosity at 30 degrees whereas 5W20 is 5 viscosity down to 20 degrees. Big difference in colder climates. In the summer, it's a different story. You can go with a higher temp rating, but would still need the 5 viscosity to insure the top end gets oil quickly on start-up.
 
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