The origianl Lenar tractors were Jaingling, previously called Feng Shou, and now part of Mahindra. When the Jaingling factory was sold to Mahindra, LENAR production was transferred to DongFeng, who had previousley supplied the Taskmaster and Avenger tractors imported by Roger Powells companies.
The DF404 is the same as our AT3814. and yes, you need UTF in the trans/hydraulics and a good diesl oil in the engine, we usually use Rotella but any good diesel oil is fine. gear oil in the front axle.
With the recent liquidation of Lenar in Texas, I do not know if Lenar is a viable entity anywhere now. We do stock parts for DF tractors and in fact I have 8 shiny new "ARTRAC" branded DF tractors arriving in about 2 weeks, including 30 and 40HP shuttle shift models and 2 AT3814s. (as well as a huge parts shipment).