Can’t speak to pre oil change detergents.
If this is synthetic oil, going 10k miles without an oil change is not a bad sin.
If twer me, I’d change the oil and filter, put in a high quality synthetic, run the engine for about 2K, or so and then change oil and filter again.
There after, use syn oil and change every 6k miles.
Camrys run forever if you take good care of them. Friend has one with 290K miles. Runs like a top.
My '92 Camry did the same after 333,000 miles on regular oil. But I did add a couple of glugs of Marvel Mystery Oil to the gas tank and crankcase at each oil change. Sold it to a Tijuanan.
I have a 2004 4-cyl Camry with 220,000 + miles...just a WOW car!