It is well known that diesel engines warm-up very lazily in winter. Especially modern, with a complex cooling system. Such as the 2.0 TDI CR CFGB diesel with robotic DSG6 transmission. This tandem is most often installed on the Octavia A5, Golf 6, Superb, and a lot of other VAG models. If the engine warms up badly and for a long time, it may not be the main thermostat that is to blame.
...
