FORD 2010 Fusion v.3 - Manual (Page 319)

An overfill condition of transmission fluid may cause shift and/or
engagement concerns and/or possible damage.
Do not use supplemental transmission fluid additives, treatments or
cleaning agents. The use of these materials may affect transmission
operation and result in damage to internal transmission components.
Checking transmission fluid level for recreational flat tow
operation
Type A
Type B
Before recreational flat towing your vehicle, the transmission fluid level
may need to be set to a lower level. These guidelines are designed to
prevent damage to your transmission. Before you recreational flat tow,
your fluid level must be verified by an authorized dealer.
This fluid level is within the normal operating fluid range and does not
require that you have your fluid level readjusted after recreational flat
tow operation.
See the Tires, Wheels and Loading chapter for more information on
recreational flat towing.
DO NOT ADD ADD (CHECK HOT)
Maintenance and Specifications
319
2010 Fusion (fsn)
Owners Guide, 3rd Printing
USA (fus)