for whatever this is worth, my brother inherited a buick from his mother-in-law years ago when she passed.
he drove it a bunch of miles using 10-30, changed oil and filter religiously, and it ran like a top.
after it topped 130k or so, he figured it was getting a little worn, so he put in the same brand oil he had been using before, but this time, 10-40.
upon fire up, it had lifter noise it never had before. as there was nothing on the dash except an idiot light, he had no idea what the pressure was.
he drove it for a week or two, and it still had the noise.
he dumped the 10-40 and went back to 10-30, and the noise was gone ! lesson learned. he used 10-30 until he wore the car out, and no more noise.