Any oil recommendations? My machine uses universal oil - i.e. same stuff in engine, hydraulic system and chain boxes and takes slightly over 13 gallons. I'll probably go with synthetic for the engine (2+ gallons, 1700-hour Kubota V1903) and that oil will most likely be rated API CG-4 SH (the newest API codes for 4-stroke diesel - CG-4; and automotive - SH). Problem is that I probably won't be able to afford synthetic for the other 11 gallons I need (hydraulic and final drives). The company tech (its a Thomas machine) suggested using the oil with only the automotive rating (i.e. API SH) for the hydraulic and final drives and concentrating on the CG-4 rating for the engine only. Question #1 - this sound reasonable? Question #2 - anyone know of a reasonably priced synthetic or non-synthetic that I could use on the entire machine? Question #3 - any reason I wouldn't want to use synthetic in the Kubota V1903? This is the same engine used in the Bobcat 751. I haven't had much luck yet and any suggestions would be appreciated. Thanks!