Does it mean I should use up the last 10% and then get my oil changed otherwise I would just be throwing money out the window (the last 10% of use)? Or does it mean get the oil changed right now because my oil is gross.
Do not think there are any direct measurements to test the oil life, rather it is all indirect and/or rules of thumb. For example 10% could mean you are 90% of the miles from the last oil change for the expected oil life.
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