Checking the oil shouldn't need to be in a checklist. It's simple good airmanship and something that you would do no matter what the aircraft is.
I mean, would you ever set off without doing a mag check? After any reasonable number of hours, things like this should be second nature...
The same goes for 99% of the stuff on a checklist.
If it's an unfamiliar type, then it would clearly be prudent to refer to a checklist just in case there are any unexpected gotcha's, but I question the value of it in your usual mount?
the trouble is that memory of repetition/routine means I am recalling checking it the flight before
Doing it by memory isn't really the right way, doing it logically is the right way.
So walking around the aircraft you check the fuel drains, stall warner, oil, prop, and so on - just in the pattern you walk around. You can't miss or forget anything then. Just make sure you end up back where you started and you know you've checked everything!
Likewise, on the inside, just do a logical scan of the panel and controls and you won't miss anything.
This is then transferrable to other aircraft too.