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Old 02-04-2013, 01:59 PM   #15 (permalink)
Master EcoModder
Join Date: Jul 2008
Location: NY state
Posts: 492

XJ Cherokee - '00 Jeep Cherokee Sport
90 day: 12.96 mpg (US)

FoFO - '11 Ford Focus SE
90 day: 36.78 mpg (US)
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Oil will turn black as it cleans, or just from every day usage. Is it possible your engine is hard on oil? Or did it have previous sludge problems? I really wouldn't be concerned about an engine turning the oil dark quickly.

Get a used oil analysis done ... that will let you know if you have a problem.
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