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    MPG, What matters most, Oil type or Viscosity?

    After about 1,500 miles on our 2002 Grand Am I kept a record of MPG for the next 2,244 miles and she Ave.35.3 MPG.Most of these miles were on factory fill oil with maybe two fillups after free oil change by dealer. The Dealer Tech.put in 10W30 weight oil I dont know what brand or if it was...
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