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Probably you can get away never washing a car also, it does not broke in 10.000miles but
* it looks nicer when it is clean
* probably it does get rusted sooner if you don not clean your car
Same thing with oil
* it does get worn quicker if oil is old and there are burning leftovers and metal particles
Seems common sense to me. Every oil company would be proud to present oil which does not need replacing at all. But they dont have such oil.
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