Hi kfdutch35,
welcome to the BB.
If you have the grey Operation & Maintenance Instructions book then the capacities are given inside the back cover.
Hope this helps.
Cheers,
Eddie B.
I do have a gray manual for a 5J. But when I looked, I could not find the engine oil. I will have to look again. Thanks
The J model is 13 qts. I bet the U is the same.
It is 14 qts. If you don't have a manual, go here and print these pages.
http://www.tractorparts.com/PDFs/EQUIPMENT%20INFO/CATERPILLAR%20CRAWLER%20D2%205U.pdf