Then allow me to quote myself in part, in brief:
"If you want to know if you can stretch out the OCI duration, then do a UOA and find out for sure (include TBN).... Why ask us when you can tell us after getting your UOA back?"
I apologize if I came off strong, but OTOH this is about the one-millionth post we see where synthetics are used is short duration OCIs, and people worry as if synthetics are the minimum, and dinos are simply never good enough no matter what the occasion. Is that your mantra? I don't know. But your limited facts stated in the initial post certainly leave you open to that presumption by the rest of us. I acknowledge that you didn't want to dump it; you stated that. But then in the very next sentence you asked if you should dump it. You didn't limit the conversation in any way, so you got an open response from many of us.
Wasted oil is wasted oil; does not matter to me what brand/grade/base stock it has. I abhor waste. OTOH, it doesn't bother other people at all. To each his own. My point is this: there are quite literally thousands of posts on this site based upon supposition, and your post just falls right in line with all those others. This site used to be about dedicated people in search of truth and facts, and it has become proliferated with people simply wanting to banter and "what if ..." scenarios. I'm OK with that; it's a free and open forum as long as we all follow the forum rules. But, when you open up a thread with a topic based not upon facts, but rather upon opinions, you should NOT be suprsied when you get an opinion that offends you; it's not wrong, just different. You didn't solict facts; you solicited opinions. That's what you got.
If you want facts, then go to the UOA section. As I recall, about two years ago, there was a UOA post where a guy ran Mobil 1 in his dad's Tundra for 10k miles and FOUR YEARS. He did a UOA and everything came back good. There are some UOAs that show going well past one year can be easily done. I, myself, do two and three year OCIs on some of my low use equipment. FACTS reside in the UOA sections. You can either glean info from those that already exist, or you could actually break out of the "what if" mold, do a UOA, and contribute to the database.
Further, the "one drop" oil test is, at the very least, at bit ambiguous, and could trend towards total bunk. Oil on a blotter really cannot tell you much at all. Here is a direct quote from one site I found:
"ONE-Drop measures the amount of sludge in the oil." Not one mention of any other ability; just "sludge". There are millions of UOAs world wide that show perfectly good oil that would be "dark" or "black" on that blotter test. Oil color is NOT a sole condition for an oil change. Oil color can only tell you one thing; the oil is either new or it isn't. But it cannot indicate whether the oil is actually good or not. Further, I cannot find any proof or even suggestion that an "oil drop" test would address things such as fuel, coolant or dirt contamination. Also, the "one drop" oil test cannot tell you about wear metals at all, although I suppose if you could see metal particles on a "one drop" blotter, you'd have a REALLY big issue, because if you can see metal particles with the naked eye, you've got engine problems that FAR surpass oil color. Coolant, fuel, insolubles, silicon, TBN, wear metals; those type things can be well defined in a UOA, but your naked eye isn't going to pick up any of those things on a "one drop" blotter test. You can put your faith there if you choose, but my advice to all these reading would be to do a whole lot more research and cognitive, rational thinking before trusting a "one drop" test for oil condition.
I cannot fathom why a person who would spend $$7 or more per quart of syn oil would find $10-15 for a UOA to be unreasonable. Blackstone costs more, but there are plenty of reasonable sources for UOAs that can be had for a very decent price. Part of my point in my first post was in implication that syn's don't pay off in short to moderat OCIs. If you cannot find any logic in spending money on a UOA, then where does one find logic in using syns and questioning their longevity? Syns and UOAs go hand-in-hand; that is the whole point. You must greatly extend the OCI to get your ROI. If you don't do that, there really is no sense in using either a UOA or a syn for "normal" circumstances.
I'll accept that I have some culpability in taunting you, and for that I publically apologize. But you must accept that you opened up yet another "what if ..." thread with minimal data, solicited opinions, and then got mad when someone didn't provide an agreeable answer.
The only way to know FOR SURE is to do a UOA. That is about as simple and factual as it gets. And that was contained in my first post.