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Message: <blockquote data-quote="Ed Fenwick" data-source="post: 856245" data-attributes="member: 67359">Aloha guys,   The way I understand it is, synthetics are more uniform in molicule size than dino oil which is refinrd by a distilling process and will will allow a grater range of distalate. That being said, the question is are synthetics worth the extra cost. Manufactures test the engines with  dino oil and say that synthetics are not worth the extra cost. People (who I trust) say that it is true that Royal Purple has better lubricating properties than other syn. oils, its extra cost makes it not worth while. I have found that in my old engines, 15-20 years and 100+ K miles, synthetic will leak before dino onto my garage floor.   IMO, if it doesn't leak, use syn. If you drive across the country every week then use the best that you can get. Whatever is in my engine, gets changed every 3K miles.      parden my rant and spelling  Ed</blockquote>