Thinking about using T5 in my pickup for the April-Nov fill and ran across this at the Shell site. Says the 10w30 is good down to -25C.
http://rotella.shell.com/products/t5.html
What makes the T5 better at lower temps than other 10w30's at 0F?
http://rotella.shell.com/products/t5.html
What makes the T5 better at lower temps than other 10w30's at 0F?