That is true for Tokyo but temperature in North could be snowy (Sapporo and Nagano winter Olympic games) and cold down to minus 8C. http://www.japan-guide.com/e/e2273.html

Also working temperature for 10W30 is from minus 20C to plus 30C (as far as I remember).

I think owners manual is generic for all Pajero though my current Pajero is for "Northern Territories" (double batteries, no sun-roof, heater in the trunk, front wipers heater)

Fight for Right to drive from Right!
www.ivoac.ca

Stay away from Nic's Garage at 120 West 1st Ave in Vancouver BC!!!