Kubota U 10-5 Operator's Manual page 84

RECOMMENDED OILS AND FUELS
Fuel used
Ultra low sulfur fuel [<0.0015 % (15 ppm)]
EGR: Exhaust Gas Re-circulation
The CJ-4 engine oil is intended for DPF (Diesel Particulate Filter) type engines, and cannot be used on this machine.
Fuel:
• Cetane number of 45 is minimum. Cetane number greater than 50 is preferred, especially for temperatures below
-20 ℃ or elevations above 1500 m.
• Diesel fuels specified to EN 590 or ASTM D975 are recommended.
• No.2-D is a distillate fuel of lower volatility for engines in industrial and heavy mobile service. (SAE J313 JUN87)
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Engine oil classification (API classification)
Oil class of engines without EGR
CF, CF-4, CG-4, CH-4 or CI-4
U10-5