10w-40 motorcycle or ATV oil designed for wet clutches is best for your 250.
1.5Liter
We're is oil Filter on a Honda trx 250 farm quad 2001
regular
It takes 1.6 quarts of engine oil.
under 2 qts of 10w40 oil
The cover to the right of the kick start that has 3 bolts
It is not serviceable. You will have to split the case. Its a good 2 day job for even your Honda dealer.
1.5 liter (1.6 US qt, 1.3 Imp qt)
Answer:
there is a open hole on the bottom of your trx250 in the casing. it is a 17mm size bolt that you have to unscrew. i am not sure how much oil to put back in but there you go. there is no oil filter
5w 20
I think 4l to 5l oil does Honda trx 450r holds.