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Hey there, welcome to the forum! Congrats on reaching 70kkm on your 2017 vehicle. As for your question about the rear axle fluid, I personally haven't gone back to 75w140, but I know some people do prefer it for added protection in extreme conditions or for towing. However, I think the recommended fluid for the rear axle on your vehicle is probably a 75w90 synthetic gear oil, so you might want to stick with that unless you have a specific reason to switch.
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