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One cannot believe a lot of these oil change indicators though. Take GMs oil life indicator in the 2500 HD Silverado with Duramax diesel for example. My 2019 will go a whopping 4 weeks during which time the oil life goes from 100% down to 2%. Then it will stay at 2% for weeks on end until I change it at which time I reset it. A post by another person a few years ago has a lengthy write up on it (I think it’s the one you linked to and he worked on it for the person who invented it) and he describes it as basically using such items as rpm, temp, miles, idle hrs, number of regeneration cycles, etc., as factors to determine remaining oil life. But something is flawed in the way it crunches the result as my driving habits during the first 4 weeks of an oil change (during which time oil life goes from 100 down to 2%) are exactly the same for the next 4 week time period during which time the oil life remains solidly at 2% for the entire 4 week period! This tells me the implementation of this oil life indicator is flawed and the results of it are not to be believed. NO reputable oil life indicator system will tell you you have lost 98% of you oil life in 4 weeks and then tell you that you have lost NONE of the remaining 2% in the next 4 week period!! The only way to determine when to change oil is by using an oil analysis or by just changing religiously every 3000 miles. Good link you provided as it’s the one I read and just commented on.
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