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Re: Changing Oil Viscosity: Myth or Fact?
Posted to Technical Theory Forum on 10/3/2007 2 Replies

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This is bugging me. The TSB that relates to the switch to 5W-30 (from 10W-30) is 99-8-16, and it does indeed state a .5% increase in gas mileage.

What I don't understand is how fuel economy is incr... Login to read more.

2 Replies Received (View Replies)