Well, it can be easy or impossible depending on how it is clocked. I have done one with a lot of cussing and scrapes to the hand and just had to send a different one to a mechanic to do because I could not get the connector off due to how it was clocked.
I watched the Scott Manley video about it. He was the one that speculated that it was possible. I don't remember if someone did the actual voice audio or if it was the NTSB test audio they figured out it could be done on.
Just make sure the oil is always topped off with whatever you want to use. You will not have an oil related failure for as long as you care to use the mower doing that.
Teflon is bad for engines so that turned it into just another thick oil additive. I use it to coat prover balls when doing water draws so they slide better.
Two of my sons and I watched it. It is cool and kinda boring at the same time since everything is automated. Wish they had some more views from the actual rocket.