All the companies in the 60s and 70s made some junk plugs. Now? I know of many cars that came new OEM with Champion and easily get over 100K miles on plugs. I wouldn't call that "junk."
My experience with Pennzoil is also quite different than your's.
Back in the 70s-80s at our John Deere dealership - we sold Quaker State, Pennzoil, and Deere Torque Guard. Quaker State had the lowest detergent rating and we used it in dirtly and badly maintained tractors. Pennzoil was very high detergency, as was Torque Guard. We never had a problem with Pennzoil except it became too pricey. We did have major problems with Quaker State. They had a bad batch of HDX diesel rated oil and there were diesel engines blowing up all over the country. They got a major lawsuit against them, and I'm not sure if they ever fully recovered. I'd never use their oil again.
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