Boiler Temperature in oil system
Is something broken?


Almost certainly.

I used to have an oil-fired forced-water heating system and the water exiting 
the boiler would be at 60C regardless of the room thermostat setting (e.g. 20C). The sort of system I used had a fixed boiler temperature. The room temperature is achieved by cycling the boiler on and off, not by continuous adjustment of the boiler output temperature.

This had a relatively simple control system, nevertheless, there's no reason for a boiler to be producing tepid water. 

Some boilers have diagnostic lights and the manuals sometimes contain troubleshooting sections.