Ranger Posted June 8, 2004 Report Share Posted June 8, 2004 Bill, 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? Link to comment Share on other sites More sharing options...
Ranger Posted June 9, 2004 Author Report Share Posted June 9, 2004 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? Link to comment Share on other sites More sharing options...
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