Re. Pad type oil pan heater. I put one on my car 2-3 years ago. No issues since then.
Sicone will not be a problem. Pad has adhesive on back. Requires cleaning and degreasing the pan surface so it will stick.
Silicone goes around rim of pad to keep oil etc from getting in. That would loosen the bond.
I found smooth surface on outer side face of pan. Bought approx 4x5 inch pad to fit that. Bottom has stupid cooling ridges.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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