You guys worry too much.
If you have any motor problems and you need service just remove it.
I worked at a dealer and we had a 25th anniversary trans am come in with a blown motor.
It had a nitrous purge valve on the hood but he removed the rest of the system first.
We know it has nos but gm told us it would be too costly to prove so we put a motor in it.
The dealer also is not as sharp as you may think they are. Plus many times the tech working on the car just wants the work so they are not going out of their way to prove you did something to your car.
Just my .02
Do what you think is best for you.