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Thanks for the input on the 5w-20 vs 5w-30. I found this article: http://www.machinerylubrication.com/article_detail.asp?articleid=518&relatedbookgroup=Maintenance that leads me to believe heavier is better in the long run.

I just bought a new Ford and am reluctant about using the specified 5W-20 and would much rather use 5W-30. I reaseached the topic on the web and found this site. Will using 5w-30 in a new Ford that calls for 5W-20 cause problems? I found this quote on the SynLube site: "You will definitely get...