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im due for an oil change. right now im running 5w-30 conventional oil. some people have told me i should switch to synthetic. my truck has 65k miles on it and im worried that switching to full synthetic might lead to some leaks that i really dont want. should i go for the switch? what about running a synthetic blend? or should i just stick with the conventional? im using wix oil filters btw. if i do switch, im probably goin to take it to a shop where they hook it up to the machine and just run synthetic through it until all the old oil is gone. if i do synthetic blend is this necesarry?