yep, its pretty much interchangable. Before my wife's grandma passed several years ago, we used to take 15-20 gallons every sunday during the fall thru early spring from the tractor tank and take out to the boonies to her house. It was cheaper than having it delivered out there. especially since we were going anyway. The biggest difference the government doesnt want you to realize is that they are not only essentially the same minus a fraction of a point or two of sulfur for emissions reasons, they are taxed differently. I think its heating oil that is taxed more than the off road diesel.