Hello you should start with no more then a 50/50 mix. You can mix it in with diesel or use diesel whenever you want. I don't know much about burning synthetic oils. Because all the oils i have are petro oils. Remember a couple of key facts.
1) Filter oil/mix really really good
2) Make sure there is no water in the oil.
Good Luck
1) Filter oil/mix really really good
2) Make sure there is no water in the oil.
Good Luck