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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Well i live on the prairies in Canada where it gets to be 35 degrees in summer and -35 degrees in winter. I run 5W20 straight synthetic all year round..... recommended by the manufacturer for the hemi engines, not sure if its the same for the 4.7L engines or not.