I just had my first oil change. The FSS system started giving me the wrench and number code at around 2500 KM! I ignored it as I was told that the oil was good for 7000 KM. The number in the code changed but not by the number of KMs I drove (I am in canada). It started as a wrench and 133 and went up by one number every 5-7 days. So the number cannot be number of miles/KMs traveled. When i finally got it in to the Chrysler dealer, I asked if the number was some sort of an "error code" and they didn't know!!

I never got two wrenches showing. They were very nice at the dealership but had no clue as to what the different numbers were telling me. Could it be that they are number of hours of running time? Does anyone know? Is it in the factory shop manual?

parillaguy