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Oil still should be changed. If you ever do the thumb and finger test you know that oil that is new is more viscous and clean than old oil. Oil that has broken down does not lubricate as well which leads to more engine wear. If you leave in in there too long it ends up feeling like water instead of oil. But you can extend the time between changes by using a good quality synthetic oil. Amsoil advertises once a year oil changes. But be sure to change the filter as a clogged filter will cause problems as well. Could you drive a car for 182k with the same oil i'm sure you could, but could you blow up your engine by using the same oil for 15k, i'm sure thats very possible as well.
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