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I used to swear by it too, but that was in the days when a 1600cc engine making 140hp would do 150,000km between rebuilds (the old ford crossflow in escorts). Now, materials, production quality and lubrication has come so far that much higher stressed engines last three times as long. Controlling fueling with EFI reduces oil contamination and bore washing, reducing the need for moly and similar additives.
Simon
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