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Old 04-20-2013, 03:39 AM   #12 (permalink)
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Fusion - '16 Ford Fusion Hybrid SE
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Common rail DPF diesels often suffer from fuel dilution because aftertreatment fuel dosing is done in the cylinders. Fuel is injected on the exhaust stroke to push it straight into the exhaust to react with the catalyst. Some of that extra raw fuel in the cylinders tends to get into the oil, especially during short commutes where frequent DPF regeneration is required.
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