52 Fuel System
Fuel Filters
NOTE! When draining the fuel filters, col-
lect the waste in a fuelproof container.
Always dispose of coolant according to
Federal or local regulations. Take the
drained fuel and water to a recycle or waste
management center.
For the Volvo engine, change the fuel filters
at every other oil change when running the
15,000 mile (24,000 km) oil drain interval.
Change the fuel filters every oil change
when running the 25,000 mile
(40,000 km) oil drain interval. Drain the
primary filter watertrap daily.
For other engines, the engine manufacturers
recommend changing the fuel filter at every
oil change. For bleeding the fuel system,
see page 134 for D12 and page 136 for D7
engines or the engine manufacturer’s opera-
tor’s manual for other engines.
W2001067
Fuel Sulfur Content
Fuel sold after 1994 for highway use can
only contain a maximum sulfur content of
0.05% by weight. This was done to reduce
particle emissions in the exhaust.
The sulfur content for off-highway use con-
tinues to be specified at a maximum of
0.5% by weight. The use of a fuel contain-
ing 0.5% or higher level of sulfur,
necessitates more frequent engine oil
changes because of sulfur deposits and
higher corrosion risk. If using fuels with
high sulfur content, the oil change intervals
must be cut in half. See “Sulfur Level and
TBN” page 68 for more information.
NOTE! The use of low sulfur diesel oil
fuel does not permit extension of engine oil
change intervals or oil filter changes.
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