Thanks, Richard. I checked all the truck stops and auto parts houses within a 40 mile range of home and couldn't find any Redline RL-2 so I checked on-line and found that RL-2 winter blend yesterday. Apparently it treats 300 gallons like the summer blend for about a dollar more than the same size bottle (15 oz.) of 85+ that treats only 25 gallons of diesel. I did do a search on this forum for fuel additives but either didn't see that thread or just glanced over it too quickly because most of it was almost 2 years old. I thought with the NCV3's having been around a bit longer now than when that was posted, maybe we learned more in that timespan. Also, I had not noticed anything that referred to the winter blend of the RL-2 so it could have been something fairly new. I ordered some of that winter blend this morning - I'll report on it when the cooler temps get here.