Volvo D11F - Manual (Page 51)

Maintenance and Service 47
Never add coolant to a hot or overheated engine. Engine damage can result.
Allow the engine to cool first.
Additives
Additives help prevent rust, scale and mineral deposits from forming.
Additives also protect metals from corrosion, prevent water pump and
cylinder liner cavitation and contain anti-foaming agents. Additives are
depleted during normal engine operation and need to be replaced. For
non-extended life coolant mixture, this means the addition of Supplemental
Coolant Additives (SCA) at any time the additive goes below the
recommended level. For extended life coolant mixture, this means an extender
package added halfway through the coolant lifetime.
Regular Coolant Change Interval
Replace the coolant every 400 000 km (250,000 miles), 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 efficiency, test the system at every
engine oil change interval, every 1,000 hours or every 6 months (whichever
comes first). For proper SCA levels, consult Service Manual.
Regular Coolant Filter Change Intervals
Hot engine. Keep clear of all hot engine parts and fluids. A hot engine and
fluids can cause serious burns.
The charged coolant filter contains 8 units of SCA that are released slowly
over time to maintain the recommended level during operation. Consult
engine service manual for proper SCA level and change intervals.
Change the regular coolant filter every 80 500 km (50,000 miles).
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