Sure you can, do it myself. If I exeed 10% I have to preheat the burner. You better predilute it before pouring it in. You do not want it to settle at the bottom.
Motorsen
If you have a good filter it shouldn't be a problem. I put the used oil from my Cummins in the tank of my truck, They advise no more than 5% . So I just put a gallon in at a time. The CDT hold 12 quarts of oil