This is exactly what happened on my 88 Camry but who wants cruded dino oil as a stop leak? I just lived with the small oil drips.It won't hurt anything, BUT, if there's a compromised seal somewhere that's currently being held shut by a bit of sludge, switching to synthetic (assuming it hasn't had synthetic all this time) could clear the sludge away and speed up the leak to where it actually drips on the driveway. At 223K, you're bound to have a weeping front or rear main seal. Switching it to a full syn could accelerate the need to get it replaced if you hate oil spots on your concrete.
I highly recommend a high-mileage oil with seal conditioners in it, even if there aren't obvious external signs of seepage. Maxlife comes to mind.
We had our 87 Camry for 33 years. Changed the Mobil 1 10w-30 ever year or 10,000 miles whether needed or not. Sold the car with 188,000 miles as mom couldn't drive anymore. Still going strong.