[Ford-ferguson] MF T035

[Joseph Knight]

Trying to recollect some specs and can't find the manual.  I believe
that the oil capacity is 6 quarts and that straight 20W was recommended. 

20W seems to be a specialty oil these days and I have been thinking
about using 15W30 (or 15W40) instead.  Any thoughts on this or is it a
doesn't matter?  I can't see where the difference would cause a problem,
but the original specs were for 20W.

Thanks for any assistance.