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Old 08-26-2001, 05:18 PM
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pmizell pmizell is offline
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
I don't want to stir up the "top end cleaner" debate again, but after using GM's top end cleaner and changing my Bosch copper plugs, then changing the oil, it added about 3-4 miles per to a gallon on my 197k 300E.

I now get 23 on avg, city/hwy mixed driving.

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