The oil itself may be fine, it is air filteration issues that prevent extra long oil change intervals in dusty environments.
Heavy earth moving equipment has huge high quality air filters, with cyclonic pre-filters, and sometimes extra oil bath air scrubbers, along with restriction monitors.
Car usually don't have all these, and a mere paper or oil/cotton air filter will allow accumulation of fine dust particles in the oil.
To the OP: Would it be possible to see pictures of the front and back of the oil cojntainers to be able to read the specifications?