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Re: Changing Oil Viscosity: Myth or Fact?
Posted to Technical Theory Forum on 9/1/2007 3 Replies

Hi Jameson,

Ford issued a bulletin a few years back that spec'd a change from 5W30 to 5W20 for nearly all cars/light trucks. The latest number is TSB 02-1-9. According to the bulletin, "Testing has validated this viscosity can be used in many previous model ... Login to read more.

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