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