Originally Posted by
driximus
I run 15-40 and have no problems starting in the 20's. I would look at your batteries first. then GP's and GPCM.
Basically, that is what Ford spec says it ought to do.
Yes, check electrical system... voltages at different stages..
Key OFF
Key on, glow plug on, pump on
key on gp on pump off
cranking
If he is much below 9.7v on cranking.. there is a problem.