Old Buick 3800 with slight oil leak

My 97 Buick Park Ave naturally aspirated 3800 has 100,000 miles on it. She looks and runs great. I average 33-34 mpg on highway. I love my car and want to keep it going for the rest of my life. I'm 56.

My car has only 1 problem. It has a slight oil leak. I had to put cardboard on garage floor where I park. I have to add ½ qt oil every 500 miles. It's a minor leak. Just a few drops on garage floor every time I park it. This is minor, but annoys me. Otherwise my car is cherry.

I'm using Valvoline 5W30 High Mileage Full Synthetic. My oil drip began after switching to this oil. Is this because I switched an old car to full synthetic or just a coincidence? I thought a high mileage oil would have enough extra seal conditioner to prevent this.

I'm considering options for a solution. Should I next time try Valvoline High Mileage 10W30 Synthetic Blend or go back to a 5W30 or 10W30 conventional?

Is there an easy cheap solution that doesn't require replacing my seals/gaskets?
I have the same 3800 series 2 in my LeSabre. Four OCI‘s using Castro GTX synthetic blend high mileage and I no longer have any leaks whatsoever.
 
My minor oil leak/drip has stopped completely. The cure was easy. My cousin changed my oil and filter.

I switched from Valvoline Maxlife Synthetic 5w30 to Maxlife Blend 5w30. No more leak/drip. It was a near instant cure.

I know it's not dripping because my cousin put fresh, clean flattened cardboard box on the floor under where my car is parked. It's a week later now. He's driven the car 3x in the last week. The cardboard is still clean. Not a drop of oil on it.
 
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