Isuzu AU-4LE1T, Maintenance Manual

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(2) Oil Viscosity
Engine oil viscosity largely affect engine startability, performance, oil
consumption, speed of wearing and occurrence of seizure, etc. Using
lubricants whose viscosity selected according to the atmospheric
temperature is important.
CAUTION:
1. Using a mixture of different brand or quality oils will
adversely affect the original oil quality; therefore, never mix
up different brand or different type oils.
2. Don’t use API, CA, CB grade and reconstituted engine oil.
3. Engine damage due to improper maintenance, or using oil
of the improper quality and/or viscosity, is not covered by
the warranty.
SAE 20, 20W SAE 20, 20W
SAE 30 SAE 30
SAE 10W SAE 10W
SAE 40 SAE 40
30 C
(86 F)
-25 C
(-13 F)
25 C
(77 F)
15 C
(59 F)
-0 C
(32 F)
-15 C
(5 F)
SAE 10W-30 SAE 10W-30
SAE 15W-40, 20W-40 SAE 15W-40, 20W-40
[Single-grade]
[Multi-grade]
Ambient
Temperature
SAE 20, 20W
SAE 30
SAE 10W
SAE 40
SAE 10W-30
SAE 15W-40, 20W-40
-20 C
(-4 F)
SAE 5W-20 SAE 5W-20 SAE 5W-20
ENGINE OIL VISCOSITY GRADE - AMBIENT TEMPERATURE
IMLE0040