Fluid's Discussion

[paint94979]

For the past 3,000 miles i've been running 15w 40 Amsoil Heavy Duty Diesel Full Synthetic Motor Oil. Is 15w too thick for my truck in the Northern California climate? The coldest at night it gets here is 35-40F for about 3 months other than that in the summer, and spring nights it doesn't go below 50f.

 

[Turbotug]

Plenty of other 5w40 or 5w30 synthetic oils to try.

I'd like to find a 5w40 in dino.

 

[The Neens]

Hope this helps kid...

http://www.amsoil.com/storefront/ame.aspx

 

[coldLBZ]

I run 15w40 Amsoil full syn. I have ran it as cold as -46C, and as hot as +35C. Working well so far, knock on wood. I have also started the truck at temps around -18C/0F without plugging in and noticed no ill effects. Hope this helps.