คำตอบที่ 8
by the book .......... 
ในกรณีใช้งานหนัก........เช่น offroad ....
เค้าให้เปลี่ยน น้ำที่ ระยะ 82,000 กิโลเมตร
SCHEDULE B
Follow Schedule B if the vehicle is usually operated
under one or more of the following conditions.
² Frequent short trips driving less than 5 miles (8
km).
² Frequent driving in dusty conditions.
² Frequent trailer towing.
² Extensive idling.
² More than 50% of driving is at sustained high
speeds during hot weather, above 90°F (32°C).
² Off-road driving.
² Desert operation
