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Reply to "5w20"

High guy's,new to the forum,I would to know if the 5w-20 oils in synthetic will protect your engine's as well as 5w-30. I have two new (2004 F-150,2004 mercury mountaineer,that require these lighter vis. oils. If this mean's anything,the service person at my merc. dealer said they did not use 5w-20,they used 5w-30,and she said it would not void your warr. What do you all think.
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