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10W30 > 5W30


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I read on cadillac forums a reply from you that the 2000 Northstars were factory spec'd with 5W30 vs 10W30. What was the reason for the change?

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Thanks Bill,

One more question if you can answer. How much difference in MPG will 5W30 give over 10W30. In other words, same engine run for a month on 5W30 then one month on 10W30 in the same conditions. What kind of MPG difference would you see?

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