I am 64 so if I think about it long enough it seems that I can often "remember" things that may or may not be true.
I have checked my
L5030 and M8540 Operator Manuals and as to oil and oil filters it goes by hours used while some things go by the calendar.
We recently moved our Massey Ferguson 375 out to the farm where my brothers live as I got to the point to where I couldn't drive it and it was not run more than maybe once a year. The hour meter hasn't worked in years, so I told my brother to check the fluids thinking that as a mechanic he might want to dump and replace. After going over it, he said he saw no need for doing anything other than to work on the electrical system and greasing everything.
I don't store the tractors I use, so everything gets run occasionally during the winter even if it is only long enough to heat everything up good.
I put about 400 hours on the 5030 and about 150 on the 8540 with about 200 on the
BX2660.