Thread: Biodegradeable Oils = Higher Fuel Efficiency?
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Old 09-14-2015, 02:44 PM   #5 (permalink)
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How big of a deal is the 3.05%? The reference oil in the M111 test looks like a 15w-40 from the 90s. How would a cheap GF-5 / SN oil compare, or a synthetic 0w-30?
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