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Samurai, do you drain the oil cooler when you do your changes? V70-XC70 1998

posted by  kcookvt on  Wed Jan 14 02:34 CST 2004
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last visit: Tue Aug 5 19:59 CST 2014
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Is it necessary or wise to do so? I'm concerned because we go from hot weather, 10W/30 oil during summer to 5W/30 during winter. Will leaving the 10/30 summer oil in the cooler while changing the rest of the oil to 5W/30 for the winter lead to any damage? (I've heard that mixing oil grades should not be done, though I've never heard of consequences as a result of doing so.)

Thanks






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