Not sure if anyone pointed this out to you in the thread but in the owners manual below is what is said:
5W 30 is preferable. If 5W 30 is not available, select the viscosity
from the chart, that is suitable for the outside temperature range.
For Thailand, Indonesia and Malaysia: 10W 30 is preferable.
(manual provides a chart on which oil covers what outside temperature as mentioned above - you can refer to the technical section of the owners manual)
5W 30 is the oil that can be used for outside temperatures of -30 to 40degC for both gasoline and diesel engines. So I think you can stick to what you are using.
All the best
Originally Posted by jonney
Hi guys, now that its getting warmer just wondering what engine oil weights you guys are running or going to run in your 2.5 litre navs? i have been using penrite 5w - 40 but thinking now to use 10 w - 40 just abit thicker for the extra heat.