What's the difference between the Mercedes ML320 BlueTec and the Mercedes ML350 BlueTec? The oil burners had neither a 3.2 liter engine or a 3.5 liter engine - both have the same V-6! So why did Mercedes change the name and badge? In an in-depth review, the Diesel Driver magazine says it is like this was done to harmonize the diesel with the gasoline ML350 - and they also report that the ML350 actually felt peppier (more "oomph" as it says in the review) than the (same) ML320 they tested two years ago - even with the same engine!
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