Hi, since getting a new or affordabble 104 EZL is like a miracle i would like to know what you know about taking care of it.

How long can last a module, in miles and/or years?
When the heat transfer paste must be changed, it dries but how can i tell?
Does ouside heat plus engine bay one can be dangerous for it?
May a fan would improve heat dissipation?
When a coil must be changed how can i tell when itīs gone bad?
Will a 103 EZL get the 104 running or is it just impossible?
What are the differences between them?
Can 103 electronics be fitted instead of a 104 ones?

Any opinion may may help to keep these module and models from disappearing.

Enzo