Just got my truck, Any ideas on what viscosity of oil to run as well? I live in canada where temperatures go as low as -35 in winter time and up 90 in summer. I know we run 15-40 in all our tractors around the farm in summer and 0-40 in the ones we run in winter, What do the duramax's like summer and winter? thanks for the help, I'd look in my manual, but I didn't get one with the truck and haven't been able to find one yet. :help
CrazyCanuck
5w-40 would be better with its lower pour point. Both are at the same viscousity once at operating tempratures. You will see easier starts with the 5w-40.
Makes a big difference in how the engine sounds cold "not plugged in" when first started. I just went with 5w40 RotellaT form 15w40 Rotella. It has only been down to 15* here so not super cold, but cold enough to tell. Last year it got down to -15 and when started "not plugged in" it would max the gauge out for a few minutes.
Congrats on your new truck. For your application, the 5W-40 is going to give you a lower pour point. For the AMSOIL CJ-4 Premium 5W-40, the pour point is -46 Deg C.
If you would like some information about AMSOIL, don't hesitate to ask. We have 2 distribution centers in Canada to help keep the shipping costs down....
Take care,
If you would like some information about AMSOIL, don't hesitate to ask. We have 2 distribution centers in Canada to help keep the shipping costs down....
Take care,
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