I'd assume that would be the case. I still can't understand your "Five Litre Death Syndrome" though. For quite a few years now I've made up 5 litres of stock and diluted it to working strength as I needed it. Probably takes me anywhere between 2 and 6 weeks to use up - and over that period the container is increasingly "not full". Never had an issue. Thought I did once - but it was a roll of TMX I'd inadvertently exposed at EI 6400!! Couldn't blame anyone for that. But obviously from this thread it's not just you.
Maybe 10 years ago, mixed up 5 liters, 2 or 3 weeks later just gave out. At the time this seemed to be an issue, sudden death as opposed to just petering out over time. I dont recall the roll count as I was using 1:1 and dumping. I am reconsidering X trol as I am slowing using up all of my old stock and want to use a developer that I dont need mail order.
Paul, was the packaging the old style packaging 10 years ago? With the smaller pt A bag made from paper? Because as I understand it that was the culprit. The part A bag allowed something to oxidize or somehow go bad if the package sat on the shelf too long. Then Kodak changed the packaging to mylar and fixed the problem.. as I understand it. I can attest that Kodak did indeed change the packaging some years ago.
I fill the fresh XTOL in 5 glas bottles at 1 liter filled up to the top!
I use XTOL replinished in my huge 2 gallon tank undiluted for a bit over a year and all was fine. With every new development i was giving 1 liter fresh developer to it after I was taking one liter out!
Now I do the same at 1:1 which is not recomanded by Kodak but for 5 month it worked also this way perfect.
But its always in a dark and cold place if not in use!
In my opinion in full strenghs it lasts almost forever with replinishing!