Engine oil in your Semi ?

[TASFarms]

0w40 if parked outside and 15w40 I’d parked in a shop. If your truck dies when it’s -30 it’s a lot easier to get it going if it has 0w40

[iceman]

If the Engine has a oil pan heater I don’t like to mix and match oil. 15w40 should be fine if plug in. Although running 0w40syn all year is probably only gonna hurt the wallet.

[farmaholic]

Hand pumping 15W40 from a barrel that is "cold" is no easy feat.

Pouring it is very slow too, so think about the flowability in the engine.

Although that is all we use.

Truck is outside but has an oil pan heater and block heater(non recirculating)

Gotta make sure it's plugged in for adequate time.

Good batteries aid in cold weather starting but don't thin highly viscous oil!!!!!