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#1
02-18-2002, 02:25 PM
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Increased Fuel Economy with Synthetic Oil
I hate to start another oil thread, but I have always heard that synthetic oil improves fuel economy. I changed my oil a few weeks ago to Castrol SynTech, and the first tankful yielded 1 additional mile per gallon (26 to 27). Now I know that one tank does not prove anything. But I check the mileage on every tank and history shows that the only reason for deviation from 26 mpg is a larger than usual amount of freeway driving, and this tank had no unusual events.
Anyway...I was wondering, if others have seen a difference in mileage with synthetic in your diesel?? 
__________________
1976 240D 1987 560SL 2007 E320 Bluetec 1998 C280 (now son’s car) 1982 240D Manual - Sold 
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