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Here's a good explanation that doesn't get too deep into the chemistry. Base Oil Groups Explained

That's because what you read is just a six sentence abstract of a 14 page paper. You haven't read the book, just the summary on the dust jacket. You have to buy the paper to get the detailed information. That Penrite paper is probably very good. In the '80s, Pennzoil published a very nice...

Did you buy and read the paper? Just reading a preview doesn't get you the testing data. But yes, someone's opinion. This guy's: Home - Professor Hugh Spikes

Friction Behaviour of ZDDP Films in the Mixed, Boundary/EHD Regime..

ZDDP causes friction. The testing has been done and is accepted fact. The white papers are available for purchase online.

Top of the line product.

That is down a bit. I'll still use it because it's enough for me. I don't get a lot of miles on my oil changes. Since ZDDP is depleted due to heat and pressure the more you have to begin with, the longer it lasts.

Shell recommends Rotella because they don't offer a product in North America whose primary application is gasoline OHV flat tappet engines. The last one they had was Quaker State Defy 10W-40. Because it was a xxW-40, it was allowed to have the higher level of ZDDP and still carry the API SN...

Yes, that's right. 1200 ppm is the sweet spot for street cars where the oil might stay in the sump for months or longer. The ZDDP can become acidic over time and consume the base additive meant to counteract acids that occur as byproducts of combustion. Excessive amounts of ZDDP have been...

Some oils are dual rated, carrying both the C & S (diesel and gas) ratings such as SN, CK-4. Many Rotella grades carried dual rating for decades. What the new FA-4 diesel oils came out a few years ago, some oil companies, including Shell, chose to stop the dual rating. Even though some oils...

Or Valvoline VR1, Amsoil, Redline, Mobil1 15W-50. There are several available with lots of ZDDP to protect flat tappet cams. You just might have to put a little more effort into finding them as they might not always be found at parts stores or big boxes.