I would go with the Amsoil, at least it pours at those low temps, not like trying to sling jello around in the engine until things warm up a bit.

 

t6 is great but in your case, thats way too close. amsoil.

 

Amsoil is the clear winner in every category, no matter the question.

On a side note, I would guess at those temps you are plugging in your block heater anyway?

 

Im plugging my truck in every night, Im just not sure if thats enough to keep the oil flowing easy. Does the block heater just heat up the oil or the coolent? Truck wont start below -23 without the heater regardless

 

watch your oil temp right after start up. If you are plugged in for at least 2 hours I bet you'll see oil temps of 0 F or better on startup. Somewhere I posted what I was seeing at minus 15 F a couple years ago but it definitely warms the oil too. At minus 15 F I saw no increase in water or oil temp after 2 hours of being plugged in. At minus 40 it might take longer than 2 hours to reach equilibrium between heat input and heat loss. We are forecast for minus 21 F actual temp tonight/tomorrow morning so I will plan on seeing what mine says tomorrow. THis wil be the coldest it has seen.

I would still opt for Amsoil and I don't sell it. It sure makes the 4 cycle snowmobiles and ATVs and misc other equipment start nice in the winter. My Truck has prepurchased dealer changes so it gets what they give it, consistent with FCA recommendations, otherwise I would have Amsoil in it up here.

 

WE had minus 20 F this morning. I turned on the block heater for exactly 2 hours. Prior to startup the evic indicated 40 deg F water temp and 4 degrees oil temp. After startup and approximately 30 seconds of running it indicated 37 deg water temp and 8 degrees oil temp. Of course the truck started easily and ran fine.

 

We haven't seen nearly the same temps in Central Ontario, as they have in Alberta, but I'll normally plug my truck in for 4 hours, and see temps in the low teens for the coolant, and maybe single digits for the oil

 

Cold test

 

If I was seeing those temps, I would have an oil pan heater, no matter what oil I was running.

 

A magnetic oil pan heater can be purchased that magnetically attaches to the oil pan. You may have to go to a specialty auto parts store to find. Probably a good idea to remove it before you drive away with it attached. A simple solution to warming up the oil. The block heater primarily heats the coolant in the block so in extreme cold temperatures it is a good idea to warm up the oil also. A couple of hours should suffice.
Now that Amsoil makes an oil compatible with ED requirements, I recently switched to it. Amsoil is an excellent oil. I know from years of experience using it.

 

My oil and coolant temps won't go below 122f. When I start the truck in the winter everything reads 122 until the temps go over that level, which takes several minutes usually. Isn't everyones truck that way?

 

My oil and coolant temps won't go below 122f....Isn't everyones truck that way?

Just the oil starts at 122°F on mine, coolant goes down to ambient.

 

Maybe it is a 2014 vs 2015 thing, my Laramie says oil is <122 until it warms up. My is set to Fahrenheit.

 

Same with my '16 Laramie. Maybe this was another thing changed in the oil spec flash update? I have no idea why they would be different.

 

The block heater warms my oil sufficiently at least at minus 20 degrees F and I am sure it will also be sufficient at minus 40 deg F with synthetic oil.

 

More than likely any half decent synthetic oil combined with the use of the factory block heater will provide enough heat to keep the oil viscous at those low temps. Now if you really want to be a hot shot forget the oil pan heaters and other stuff, get a coolant pre heater pump like these ones in the link below for TDI's. I installed one about 9 years ago on our TDI and have never looked back. I even made my own kit with the same Zero Start coolant heater they use in another vehicle, worked super awesome.

FrostHeater.com - Welcome