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Old 06-12-2013, 06:06 PM   #188 (permalink)
E300D
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Join Date: Mar 2011
Location: New Jersey
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What is the real MPG gain by changing to all synth, motor oil, trans, diff, bearings?

I have to get almost all of this done as routine upkeep on my 1997 Mercedes E300D.
I know it's on the list, but really. Has anyone done a before and after?

If it's on the forum already I couldn't find it. Point me in the right direction.

Thank you.
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