ML 2510 here also keeps slogging on, usually the rollers need a wipe with a lens tissue about every 2 years or so. it is bad for the rubber so it doesn't get done unnecessarily.
I really like the cartridge protection on the cartridge. It keeps a count to around 5000 pages before it starts to refuse to print more than 1 page at a time (you have 2 switch it off in between prints).
I found this out when swopping between 2 cartridges, I had refilled one with a bottle of toner that wasn't perfect it puts a line down a page but for print outs it is ok, so I use it when a print doesn't need to be high quality.
But back to the cartridge protection the counter reset is digital with a fuse :)
A new cartridge has a fuse attached to a holder on the back it isn't electrically connected to it.
it's around a 200/400mA fuse TV repair shops keep them for repair jobs.
when a new cartridge goes in it connects to the fuse and blows it
the effect is a digital 1 0 using a bit of foil gets a 1 1 and that will not do the reset.
Taking out and reinsert the cartridge that is a 0 0 so the counter keeps counting which is why it caught me using 2 cartridges, the page count got too high , low on toner just means you have probably printed enough pages to have used most of it. There is no measurement of toner.
But isn't that such cool protection, no chips on the cartridge just a plain old fuse. One of my old canon inkjets shines an led through the cartridge when light gets detected then it is out of ink and needs refilling :)
One of my favorite printers is an epson it can do black & white photo printing with just the black cartridge you need to tell it to print gray scale on plain paper but use photo paper. With a little tweaking usually lightening the image a little you get a really nice print. With the normal method the inkjet mixes magenta and cyan which tends to lead to magenta in the shadows and cyan in the highlights and this degrades over time due to the uv. with the single black it stays true black from start to finish.
I have prints using both techniques and the color ones are a pale miscolored comparison after just a few years where the black ink printed ones are still looking as good as the day i printed them. For something exceptional a silver halide print is still the best.