2nd, this is unlikely. The DPF is more likely to fail by itself....and if it does melt then you've got another problem that's causing it to get that hot. Sometimes they do melt but this is rare and is caused by another problem.
No, you are safe. I would think that at worst, if the extra heat doesn't burn up the extra build up, it would call for more DPF cycles, which I doubt. The whole point of the DPF is for when it doesn't get hot enough. Maybe LSD or Bio could cause clogging. Plus, other cars/trucks have DPFs and you don't hear of problems on those.
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