i have used adhesive silicone on many items, but never where heat was involved.
it does work good sealing in oils and other liquids in the non heated applications i have used it in, and also "glues" stuff together well ! it isn't any harder to remove than regular RTV.
i have just been apprehensive to use it in heated automotive applications such as transmission and engine oil pans because i was unsure it would stand the heat.
i guess i might have to try it now.