Kubota WSM 05-E4B Series Workshop Manual page 61

• Oil used in the engine should have API classification and proper SAE engine oil viscosity according to the ambient
temperatures where the engine is operated.
• With strict emission control regulations now in effect, the CF-4 and CG-4 engine oils have been developed for use
with low sulfur fuels, for on-highway vehicle engines. When a non-road engine runs on high sulfur fuel, it is
advisable to use a CF or better classification engine oil with a high total base number (a minimum TBN of 10 is
recommended).
Fuel
CAUTION
• When changing or inspecting, be sure to level and stop the engine.
• Cetane rating: the minimum recommended fuel cetane rating is 45. A cetane rating greater than 50 is preferred,
especially for ambient temperatures below -20 ℃ (-4 ℉) or elevations above 1500 m (5000 ft).
• Diesel fuel specification type and sulfur content % (ppm) used, must be compliant with all applicable emission
regulations for the area in which the engine is operated.
• Use of diesel fuel with sulfur content less than 0.10 % (1000 ppm) is strongly recommended.
• If high-sulfur fuel (sulfur content 0.50 % (5000 ppm) to 1.0 % (10000 ppm)) is used as a diesel fuel, change the
engine oil and oil filter at shorter intervals. (approximately half)
• Do not use fuels that have sulfur content greater than 1.0 % (10000 ppm).
• 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)
• Since Kubota diesel engines of less than 56 kW (75 hp) utilize EPA tier 4 and interim tier 4 standards, the use of
low sulfur fuel or ultra low sulfur fuel is mandatory for these engines, when operated in US EPA regulated areas.
Therefore, please use No. 2-D S500 or S15 diesel fuel as an alternative to No. 2-D, and use No. 1-D S500 or S15
diesel fuel as an alternative to No. 1-D for ambient temperatures below -10 ℃ (14 ℉).
SAE:
Society of automotive engineers
EN:
European norm
ASTM:
American society of testing and materials
US EPA:
United states environmental protection agency
No. 1-D or No. 2-D, S500:
Low sulfur diesel (LSD) less than 500 ppm or 0.05 wt.%
No. 1-D or No. 2-D, S15:
Ultra low sulfur diesel (ULSD) 15 ppm or 0.0015 wt.%
05-E4B SERIES,05-E4BG SERIES
3. MAINTENANCE
3-3
KiSC issued 03, 2023 A