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MM is a dependency
KCT is recommended for "full" experience
Kerbalism is supported (its modules are removed from engines)
KSP versions 1.8.x, 1.9.x, 1.10.x are supported
You can build the mod for lower versions (at least I'm sure source code is compatible with 1.7.x)

Engines fail if they run for too long
Engines have limited ignitions (Engine Ignitior can be installed to add ullage, ignition limits stay under P2P control)
"Rated burn time" and number of ignitions can be configured while editing a vessel
These tweaks increase engine's cost and mass
Ignitions have configurable chances to be wasted and to cause a failure
Configurable chanse of engine destruction on failure
Speical treatment for SRBs (failures only on ignitions), see how to turn it on here or provided configs
Ignition failure, failure on ignition and destruction on failure probability depend on reliability progress
Recovered engines improve "reliability", reducing early failure chance
Procedural S/HRBs have separate reliability progress for "models". In order to gain usage experience on further recovery, press "Set as a New Model" button (if it is present)
Configurable thrust and diameter margins for procedural S/HRB "models"
It makes sense to have 4-6 burn tests before using a recently developed engine
You get no refunds for used engines. To make craft reusing useful, reuse your vehichles via KCT recovery. More info here
Some sort of engine stats configuration
Sibling Reliability Progress