I change my oil every 10,000-13,000km. I have an oil life monitor and its never gone below 25% oil life. I use synthetic and the computer measures the way I drive and the viscosity of the oil. My truck uses 9.8 liters every oil change so I'm not keen on spending $125 on material every 5000km if it doesnt need it. I spent $450 getting my transmission flushed with synthetic allision fluid. Its supposed to be good for another 160,000km now but that was pretty steep.
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