The fluids may be “warm” but you also need to wait for the engine block to heat up. Metal contracts when it’s cold and forms a tighter grip around the pistons causing excessive wear in the cylinders if you don’t let the engine block get nice and warm.
H4wkeye47 t1_iur5kfh wrote
Reply to comment by dr_xenon in 30 minutes of car preheating in sub-zero conditions produces as much particulate emissions as driving 97km in a gasoline car, or 20km in a diesel car “These findings do not suggest to stop preheating cars; instead, we could reduce the emissions by using similar methods that are in place for engine” by giuliomagnifico
The fluids may be “warm” but you also need to wait for the engine block to heat up. Metal contracts when it’s cold and forms a tighter grip around the pistons causing excessive wear in the cylinders if you don’t let the engine block get nice and warm.
Block heaters for the cold are the best option.