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The older 6.0 was great. Joy filled with gas down in Florida. Pumps were different color at some stations. Other than run real crappy, she did not destroy the 6.0 diesel. A nearby shop drained tank and replaced fuel filter. All was good. Later our local mech said if it was the 6.4, it would have ruined it. These new 6.7 diesels are monster pulling machines. No need to tune and chance voiding the warranty.
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