Originally Posted by SpLaT

Hey Dr.Evil, seems even Shell is contradicting itself...

http://www.shell.com/home/Framework?...t6_detail.html

or

http://www-static.shell.com/static/c...rotella_t6.pdf
(graphs/comparisons easier to read here)


or this...

http://www-static.shell.com/static/c...cants/1-52.pdf
this indicates a pour point of -45 deg C
ps. it does run off the dipstick pretty fast at -40 deg C

either way.. I'll stick with what is working well for me.


as for making sense.. Shell/Dutch.. they wear wooden shoes for pete sake!

Originally Posted by Dr. Evil

As far as I know thats not a full synthetic. If you look at the MSDS for the Rotella -

http://www.epc.shell.com/Docs/GSAP_msds_00051969.PDF

You will see that there is mineral oil in it, unfortunately it doesnt tell you how much. A TRUE synthetic should not have any mineral oil in it. A Group IV syn like Amsoil HD Marine and Diesel does not contain mineral oil -

https://www.amsoil.com/msds/ame.pdf - just because a manufacturer calls and oil "fully synthetic" doesnt mean it is.

Another thing to note is the pour point. The Rotellas looks to be -20C - which is not very good but will probably work ok for you this time of year. The Amsoils is -42F which is better, but there are some oils that are -50 of better.

Originally Posted by Mike Holmen

I have to cycle the heater grid three to four times before the truck will even thinking about trying the starter. Also click my emerg brake down one click to turn off the headlights. Helps keep the battery voltage high enough for my fass fuel pump can run.

25K between oil changes, wow. I'm a chicken to even go 10k.