Toyota TACOMA 2010 Quick Reference Manual page 198

2-4. Using other driving systems
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Shifting to L4
VSC is automatically turned off.
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Four-wheel drive usage frequency
You should drive in four-wheel drive for at least 10 miles (16 km) each
month.
This will assure that the front-drive components are lubricated.
CAUTION
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Caution while driving
Never operate the front-wheel drive control switch if the wheels are slipping.
Stop the slipping or spinning before operating.
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