I can't answer that, as I don't know what his experience was, BUT I know what my EXPERIENCE concerning PENNZOIL has been.
I bought a CJ5 new in 1967. It had the V/6 in it and I was working part-time at a big Texaco station just off I25 in C. Springs, CO. My love of the back country meant that I was putting on a lot of miles every weekend besides my daily commutes to two jobs and home again (Manitou Springs), and so I was religious about maintenance. I changed the oil and filter, without fail, at every 3,000 miles. After a weekend foray with a lot of water crossings the gear boxes were checked and drained and refilled if needed. I tell all of this to verify that there was no skimping on preventative maintenance with this Jeep.
One of the issues with the Buick V/6 was the plastic toothed camshaft sprocket which began to make noise at about 40k. When I replaced the sprocket at the station with a steel replacement I noticed a very sticky, grey scum inside the timing cover. I got the boss to look at it and his first question was 'What kind of oil are you using?. Pennzoil?'.
'Yep.' says I, 'Why' He said that Pennz was the only oil that he had seen do this. He recommended Texaco's Havoline and that's what I switched to. Several years later, I had occasion to drop the pan at about 80,000 miles. There was NO sludge of any kind and the oil consumption between changes was less than a quart even at trade-off mileage of 93,000 miles.
I realize that this an old story about old oil but ,hey, I'm an old guy! Pennzoil MAY have changed, but I haven't! I have not used a drop of it in over 50 years.
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