I dont know his reasoning, some of the other postings had good explanations but i do the same thing when breaking in a motor. When i break in my engine after a rebuild i use regular oil for the first 1000 miles then change the oil to full synthetic. My reason is because immediately after breaking in the engine, you need the change the oil. So why waist $40 on Synthetic when your only going to use it for 1k miles when you can spend $10 but regular. Anyway, that's why i do that.
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