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7

Mixing new with the old will cause you absolutely no issues. As long as you are using the same weight oil, it will mix up and you'd never know it. Continue to change your oil at the specified interval and you should be golden.


3

Usually when changing the oil you won't be able to fully drain the old oil anyways and the old and new oils will mix, like it or not. Usually this is not a problem even if the weights are different, though it's safer to stick with the same brand, as some argue the components in the oil being incompatible may cause issues. What you should be wary of is ...



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