Thread: Interesting Cold Start Fix / Seafoam?
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  #20  
Old 02-04-2011, 09:30 AM
Rage0582 Rage0582 is offline
MeandMy300E
  
Join Date: Sep 2005
Location: Western MD
Posts: 28
Marvel mystery oil
I use Marvel Mystery Oil every time I fill up. I see better fuel economy in my '88 300E because of it. I would say 1-2 MPG better on average, which is great considering I'm running 93 Octane fuel.
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