Quote Originally Posted by ziero0 View Post
Likely diesel. I don't believe I have seen any gas models. Some farmers would have Detroit diesels installed and once in a while you see these on auction.


According to this you could have diesel, gas or lpg

https://www.tractordata.com/farm-tra...eere-4020.html

Total built: 184,879 (total)
8,123 (gas)
8,445 (LP)
168,311 (diesel)
17,732 (standard)
Original price: $10,345 (1972 )