406dn
Well-known member
- Joined
- Dec 12, 2019
- Messages
- 2,269
Okay, I'll share what I know concerning #2 diesel and how I handle it.
As mentioned above I worked for 28 years in a oil refinery, testing laboratory. Among other things, I tested a lot of diesel.
So, in no particular order
Diesel will suspend, dissolve, hold more water than gasoline will. Since their respective densities are closer than gasoline and water, it takes longer for water to fall to the bottom with diesel. How to handle it? Do not EVER buy diesel at a station if you see they are getting a delivery. Every delivery stirs up the water at the bottom of the holding tank. If you buy as they are getting a delivery, you are greatly increasing your chance of getting wet diesel.
Refineries in the northern US make a summer and winter grade of #2 diesel. They cover the winter very well with the winter grade leaving the refinery. But if you filled a can with diesel in August, and go to use it in January, it will gel at distinctly warmer temperatures than will winter grade diesel.
The refinery where I worked put more #1 diesel into #2 diesel blends during the winter than they did in the summer. That obviously helps with the pour point and the wax appearance test. Often it can be the wax falling out, that plugs the fuel filter. That is one reason why I add #1 diesel during cold snaps below -15F give or take.
#1 diesel has less lubricity than #2 diesel. So if used in warmer weather, it might cause engine wear. So, I don't ever go with straight #1 diesel. You also will get less milage, whenever you are using #1.
So here is how I manage my diesel truck. I have NEVER purchased a diesel additive. Oil refineries add them while the diesel is being produced. In the winter, if I'm just knocking around and a tank of fuel might last two weeks, I NEVER fill the tank past half full. That leaves enough room to top off with enough #1 to keep you from gelling in most any conceivable temperatures you'd see in Montana. If I've topped off a tank with #1, I drive that tank down to, say a quarter tank. Then the next fill, is either with #1 or #2, temperature depending. That fill is to a half tank. Then once sub minus ten degrees are in the rear view mirror, go back to putting #2 in without a worry. The only time I fill a tank entirely in the winter with #2 is if I know that will get used before a cold snap is forecast.
As mentioned above I worked for 28 years in a oil refinery, testing laboratory. Among other things, I tested a lot of diesel.
So, in no particular order
Diesel will suspend, dissolve, hold more water than gasoline will. Since their respective densities are closer than gasoline and water, it takes longer for water to fall to the bottom with diesel. How to handle it? Do not EVER buy diesel at a station if you see they are getting a delivery. Every delivery stirs up the water at the bottom of the holding tank. If you buy as they are getting a delivery, you are greatly increasing your chance of getting wet diesel.
Refineries in the northern US make a summer and winter grade of #2 diesel. They cover the winter very well with the winter grade leaving the refinery. But if you filled a can with diesel in August, and go to use it in January, it will gel at distinctly warmer temperatures than will winter grade diesel.
The refinery where I worked put more #1 diesel into #2 diesel blends during the winter than they did in the summer. That obviously helps with the pour point and the wax appearance test. Often it can be the wax falling out, that plugs the fuel filter. That is one reason why I add #1 diesel during cold snaps below -15F give or take.
#1 diesel has less lubricity than #2 diesel. So if used in warmer weather, it might cause engine wear. So, I don't ever go with straight #1 diesel. You also will get less milage, whenever you are using #1.
So here is how I manage my diesel truck. I have NEVER purchased a diesel additive. Oil refineries add them while the diesel is being produced. In the winter, if I'm just knocking around and a tank of fuel might last two weeks, I NEVER fill the tank past half full. That leaves enough room to top off with enough #1 to keep you from gelling in most any conceivable temperatures you'd see in Montana. If I've topped off a tank with #1, I drive that tank down to, say a quarter tank. Then the next fill, is either with #1 or #2, temperature depending. That fill is to a half tank. Then once sub minus ten degrees are in the rear view mirror, go back to putting #2 in without a worry. The only time I fill a tank entirely in the winter with #2 is if I know that will get used before a cold snap is forecast.