All of the following statements are true EXCEPT:

A. aluminum oxide is very abrasive; it is what sand paper is made of.
B. if there is aluminum oxide in the cooling system, it looks like black sand beads.
C. when flushing a cooling system with aluminum oxide contamination, heat the engine to operating temperature and reflush the system at least three times, heating to full temperature each time.
D. using a commercial chemical cleaner, the radiator can be flushed but it must be removed from the car.


Answer: D

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