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  1. W

    432,000 miles and uses oil

    Hi. First time user. I have a 2000 Eddie Bauer with a 5.4 Triton. We bought it new. For the first 16 years I used conventional 5w20 oil and changed it every 3,000 miles. Then I read an article that said the engine would perform better if it was run with full synthetic. For the past 3 years...
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