Will the oil riga grinding sand engine be scrapped

Probably not, because the oil must be filtered before entering the engine for lubrication, so it will not damage the engine shaft, but the frosting may damage the oil pump, which will accelerate the deterioration of the oil quality, so the oil should be changed in advance.

Basically, it will, depending on how much sand you use and how long you use. The more sand, the longer it takes, and the more wear and tear it has. At a certain point, it can't be repaired.