Isuzu N Series 2008 Owner's Manual page 387

Use a mixture of engine coolant and tap water as the engine coolant to prevent engine
damage due to freezing and to protect the cooling system from corrosion. Use only an
Isuzu recommended mixed with tap water at an appropriate concentration.
Engine coolant concentration and
freezing temperature
Select the mixture ratio for a freezing
temperature that is about 10°C (18
°F) lower than the expected outside
temperature.
When using an engine coolant other than the Isuzu genuine engine coolant (Isuzu
specified product), use the following mixture ratios:
When the outside temperature is above −40°C (−40°F): 50% engine coolant and 50%
tap water
When the outside temperature is −40°C (−40°F) or lower: 60% engine coolant and
40% tap water
Engine Coolant Quantity
The quantity of coolant is indicated below for your use as a guideline when changing
the coolant. After changing the coolant, check that the coolant is up to the specified
level.
Engine model
4JJ1
4HK1
2008N_sec07-1_print2.indd 41
SERVICE AND MAINTENANCE
Preparing Coolant
When using Isuzu genuine engine coolant,
the percentage of engine coolant in the
coolant should be 50%. If it is more than
60%, overheating is likely to occur, while
if it is less than 30%, the coolant's anti
corrosion performance will be inadequate.
Coolant quantity [Reference value]
10.0 litres (2.64 US gal./2.20 Imp gal.)
18.0 litres (4.76 US gal./3.96 Imp gal.)
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