97subaruGT Posted July 9, 2005 Share Posted July 9, 2005 In general, is it a bad idea to go from synthetic oil to regular mineral oil on a 40K mile engine? This is regarding a 2000 Altima, btw. Thanks Link to comment Share on other sites More sharing options...
MiniTransAm Posted July 9, 2005 Share Posted July 9, 2005 I don't believe your going to damage anything. However I think the long term benefits of better wear protection, better gas mileage, and cooler engine temps far outway the extra cost of synthetic fluids. Link to comment Share on other sites More sharing options...
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