Are there at least 2-3 threads nearest the head of the bolt?
I have been burned in situations like this. It will feel fine for now, but without enough threads, the bolt will loosen up after some heat cycling.
It's hard to explain without a picture. There is still a thread pattern the whole way through, but about 2/3 of the outer height of the threads pulled off. So even when I put the drain plug just a turn or two it still felt secure, no wiggle, even though the threads aren't totally there.
Deep inside the last two threads were still fully intact.
I was saying the factory drain bolt still felt secure but I decided to use the Amazon bolt that is slightly oversized. It bites into the aluminum pan pretty well.
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