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Message: <blockquote data-quote="TomT" data-source="post: 561285" data-attributes="member: 55397"><p>I run 10-30. I know, I know. The manual says 5-30 but thats a generic weight for everyone from Alaska to down here on the Gulf Coast. There is simply no reason to have 5-30 in an area that rarely sees temps below 40. I have been changing mine every 3-4K but just went to Royal Purple and plan to leave it in for at least 7K.  Can't understand why anyone would change synthetic before then. Otherwise why not just use dyno? Everything I have read says  that the only real advantage of synthetics over a top grade dyno is they last longer.</p></blockquote><p></p>