CAT 3126 long crank time

[flatbed94kid]

(02-06-2019 )Unilevers Wrote:  put gear oil in it with the oil change, not kidding it will make a world of difference. About 1/8 of the total 75w90. As those old heui engines age they get lazy on the starting due to the pump/lines leaking slightly etc.

Is gear oil still good when in the cold? Could the extra thick oil mixed thicken to much due to cold weather and make engine work harder?