Ya, like Dan, I'll stick to what has worked for me too, because I've never ever had to have an engine tore down for nothing or replaced. Now if that is due to regular oil changes or not one can't be sure, but I figure dropping oil & a filter in regularly is easier than coughing up for a new engine. I guess the answer is do what works for you, even if it is changing the oil only every 10 or 20,000, but not for me.
I don't know about that magnet Fabs, never tried one. I know that my Blazer had a magnetized oil plug, which did have a few small shavings the first time I changed oil in it, bought new, but from then on there was never anything on it. So I'd say after the first few thousand miles, it wouldn't have anything to pick up. It won't hurt anything though.
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