Posted by sotxbill on February 14, 2021 at 11:11:29 from (104.5.24.112):
In Reply to: Synthetic Oil posted by MtMan on February 14, 2021 at 06:45:46:
The group III blends will perform as well as the group iv or group v in normal use and your engine life will be the same.
EXCEPT.... in extreme temperatures where the group iv and v oils will exceed. SO>.. If you run your tractors and equipment below zero,,, or when out side temps are above 120,, you might... want to move up the 4 and 5 bases oils. All of the hd oils use the exact same additive package which it what does the most work. Since I dont plow below zero or when its above 120,,,, the normal 15w-40 hd diesel oils with the heavy duty additive package,,, are fine... The 5w40 oils will have the 4/5 base oil if you run outside the normal temps. Space craft MUST use the group 4 and 5 oils due to the extreme temps in outerspace. My equipment currently does not go that high.
Remember that in Siberia, its so cold that the city equipment must be started in side the heated garage, and not shut off till it returns to the heated garage. Those folks should run a group 4 or 5 base oil. It was minus 89.9 degrees F at one time. Turning off an engine there is immediate dismissal if you live long enough to get back.
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