21 Jun, 2014 large, moreover, if the sand making machine works for a long time, the temperature of each parts will be very high. So the lubrication oils should have strong thermostability.
2. As we know, during operation, the sand making machine can produce some pollutions such as dust, so the lubrication oil should has strong abilities of antirust and anticorrosion. And in this case, even if there is some im
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