One of the primary variables in the detonation equation is air inlet temperature. The hotter the inlet air, the more tendency to detonate, so there is less tendency to detonate in cold winter weather.

Listen for detonation. It is most likely at low revs and high load. Less likely at high revs, high load.

Since I only drive my 190E 2.6 during the winter, I use 87 PON. If I short shift and load up the engine too quick I get a little transient detonation, but I have learned to adjust my driving habits to avoid it.

Duke