This came up as a discussion the other day. I live about 10 miles from town and drive about 55-60 mph the whole way there so the engine gets nice and warm and stays warm for most of the trip. I view this as a long trip as everything gets warmed up and any moisture should be blown out through the PCV and not accumulate in the oil. Now, I have a friend who sees a long trip as something a half hour or more away. I view it as the engine simply getting up to operating temp and staying there a while.
Now for the short trip. I have a neighbor that lives 1/4 mile from me. I sometimes drive up for dinner and sometimes walk. I view these drives as a short trip as the engine barely runs at all to get there and doesn’t even start to warm up. I am sure this isn’t good for things at all as I usually do this twice in one day when it happens. Now, lets say I am coming in from town and stop there first for a minute and then go on home. Sure, the car is turned off for a bit and then restarted and run for another 1/4 mile but I view this as part of the same “long trip” since the engine is still nice and warm.
I want to hear what others think about this situation and if simply getting the engine warm for 10 miles or so is considered a long trip.