44 Cooling System
Regular Coolant Change Interval
Replace the coolant every 250,000 miles
(400,000 km), 4,000 hours or every two
years, whichever comes first.
Coolant SCA level must be tested at least
twice per year or whenever coolant loss
occurs. For maximum coolant system effi-
ciency, test the system every 25,000 to
30,000 miles (40,000 to 56,000 km) de-
pending on engine oil change interval or
every 1,000 hours or maximum every
6 months (whichever comes first).
The SCA level must be between 1.5 (Cum-
mins: 1.2) and 3.0 SCA units per gallon
(0.4 [Cummins: 0.3] and 0.8 SCA units per
liter) of coolant.
NOTE! Always dispose of coolant accord-
ing to Federal or local regulations. Take all
used coolant to a recycling or waste collec-
tion center.
Coolant Filter Change Intervals
The charged coolant filter contains 8 units
of SCA that are released slowly over time
to maintain the recommended level during
operation. Change coolant filter after the
first 30 days or 6,000 miles (10,000 km).
Thereafter:
Change the coolant filter at every other oil
change when running 10,000 to 15 000
mile (16,000 to 24,000 km) intervals (every
oil change when running 25,000 mile inter-
vals on a D12). If the SCA level tests
above 3.0, DO NOT replace the filter.
When testing indicates that the SCA level
has dropped below 1.5 units per US gallon
(0.4 units per liter) start changing the filter
with the oil changes again.
NOTE! Test the SCA level every 6 months.
WARNING
Hot engine. Keep yourself clear of all
hot engine parts and/or fluids. A hot en-
gine and/or fluids can cause serious
burns.
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