"CRUSADER
250," "250
CLIPPER"
AND
"CRUSADER
SPORTS"
mild detergent properties. They are therefore especially
recommended for winter use
if
difficulty is experienced
with starting owing
to
the gumminess
of
normal S.A.E.30
oils when cold
and
if
the owner does
not
wish to take the
precautions necessary when changing to a highly deter-
gent oil.
11
Detergent Oils.
Many
of
the oils which
we
recom-
mend contain detergent additives designed to counteract
ring sticking and sludge formation.
The degree
of
detergency varies not only between
one make and another
but
in some cases between different
grades
of
the same make
and
may even be different for
the same grade
and
make
of
oil in different parts
of
the
world.
If
one of the more highly detergent oils is used in
an
engine containing large deposits of sludge which have
accumulated when running on another grade of oil this
sludge will be loosened and may cause seizure and other
trouble due to blockage of filters and oilways.
For
this reason the following procedure should be
carried out when changing to one of the more highly
detergent oils, particularly
if
the engine bas been used
on a normal grade of oil
or
bas not had the oil drained
and changed
at
regular intervals as recommended in
Section
8.
(1)
Drain the engine when the oil
is
hot and refill
with detergent oil.
(2)
Run
the machine
at
moderate speed for not
more than 50 miles.
(3)
Drain the engine again when the oil is hot, flush
out the oil tank with detergent oil, remove, clean
and replace filters (preferably
fit
new felt filter
element). Refill with detergent oil.
(4)
When machine has run a further 100 miles,
check condition of filters.
If
clogged, repeat
operation (3).
Note. Although the detergent additive in the oil
keeps the engine clean and prevents sludge formation, it
naturally becomes used
up
in the process.
If
an
engine
12
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