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No bullshit. When I topped up oil, I would reset the trip odometer. Once it reaches 1000km, it will self reset to 0. Once that happens, I would top up as soon as possible. Like clockwork, I always needed oil to the quantity of a 1L small jug. So if you take oil changes into consideration, about ~6.5L, by the 5000km interval, all the oil would be mostly new. That said, since I've swapped to rotella, I do about 12,500km intervals, with quarterly testing at Blackstone. The data with rotella on e46fantatics suggested a recommended interval that equaled to 30,000km. I decided an arbitrary 60% earlier than recommended would work for me.
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