I bought myself a new "project" on wednesday. Its a 1990 743, with a slight problem... it has had an engine bay fire. It will keep me busy for a few months...... at least. My question is, what oil does this model use? the oil looks and smells like automatic transmission oil. I always thought that all hydrostatic transmissions had to use heavier oil like i run in my 731 (i run Castrol RX Super). I have to order the parts and service manual for this machine in the next week or so. I'm sure i will have more problems/questions in the near future. Lickily the fire didn't do too much damage, it did eat up almost all the fuel lines, the fan cover is a molten mass, the radaitor core is stuffed, plus a few other small things.