I use AMSOIL Full Synthetic 10W-30/SAE 30 Diesel Oil (ACD) in my Kubota
B7500 in Spring, Fall and Winter.
Here are the specs:
Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 10.9
Kinematic Viscosity @ 40°C, cSt (ASTM D-445) 71.4
Viscosity Index (ASTM D-2270) 141
Cold Crank Simulator Apparent Viscosity @ -25°C, cP (ASTM D-2602) 5165
Pour Point °C (°F) (ASTM D-97) -38 (-36)
Flash Point °C (°F) (ASTM D-92) 232 (450)
Fire Point °C (°F) (ASTM D-92) 246 (475)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800) 6.3
Four Ball Wear Test (ASTM D 4172B: 40 kg, 75°C, 1200 rpm, 1 hour, Scar in mm) 0.40
Total Base Number 12.0
In the very hot Summer months I use AMSOIL Full Synthetic SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil (AME)
Here are the specs.
Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 14.4
Kinematic Viscosity @ 40°C, cSt (ASTM D-445) 89.7
Viscosity Index (ASTM D-2270) 167
CCS Viscosity @ -20°C, cP (ASTM D-2602) 4477
Pour Point °C (°F) (ASTM D-97) -42 (-44)
Flash Point °C (°F) (ASTM D-92) 234 (453)
Four Ball Wear Test (ASTM D-4172B: 40 kg, 75°C, 1200 rpm,1hour),Scar, mm 0.35
Noack Volatility, % weight loss (g/100g) (ASTM D-5800) 6.8
High Temperature/High Shear Viscosity (ASTM D-4683 @ 150°C, 1.0 X 106 s.-1, cP 4.4
Total Base Number 12.1