When I did a oil change I measured the bolt and its thread pitch, mine is the 25 ton with the kholer aka honda copy with two m10x1.25 drain plugs so I got two of these
https://www.amazon.com/gp/product/B0114TT4FC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
and also this one for the dip stick
https://www.amazon.com/gp/product/B07VK1H6HG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
now when I change or check the oil they have a very small amount of ultra fine metal on them but those first two changes were loaded with metal. The shuttle style wedge wears where it rides in the rail allowing it to cock under load but still functions. I ran abut 40 cords through it before it became noticeable but some of those logs I was splitting were gigantic. 16-20 inches long but 24+ inches across of gnarly knotted super hard to split hickory and oak but the machine just powered through it slowly, thats why I oil the slide area after use and keep the ram stored fully retracted. The engine air filter stays pretty clean if you wash and oil its prefilter every few tanks, I had to re jet the carb one size up because it was just too lean and I could hear the engine pinging in the colder temps with the machine warmed up. Now I split 99% of everything at 1/2-2/3 throttle with ample power. The wheel bearings had very little grease and failed under 20 miles, the shuttle bearings and a 4 way wedge were replaced under warranty. The 4 way works great at making kindling and on straight logs under 10 inches in diameter if you need lots of smaller splits that will dry fast. I added the shelf to mine, super helpful and also I threw away the crappy spring pin for the hitch ball latch and replaced it with this to make it harder to steal
https://www.amazon.com/gp/product/B001IH2T4Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Tools I highly suggest to use with the machine are a light sharp hatchet to cut fibers in larger logs the machines wedge is too small to split it in one shot. The other tool is a hook or picaroon to move things around and even as a lever to hold split logs apart or tear them and for that last stinking piece you cant reach in the center of the truck bed!!!!! When I pull it I put the bed down to remind me to keep my speed under 45mph and I get out to touch the hubs after driving to check for excessive bearing temps, this saved my butt many times from ruining hubs/bearings. Next I plan to put neodymium magnets on the hydro oil filter...its the mechanic in me I just cant help it hahaha and to possibly get larger ends on the hydro lines as the metal between the fitting and the hose is reduced 1/4? vs the hose id.