As many of us, myself included, like Shell Rotella, be advised that
oil is an ever changing product. What was good yesterday (or last year) may not be good this year!!!
Rotella as an example. It used to carry a CI-4 rating, now it's CJ-4 "and meets the requirements of CI-4 plus." Meeting the requirements is not good enough, it aint CI-4, period. It's been reformulated to reduce particulate matter in diesel trucks, they did that by a significant reduction in the ZDDP levels. Which is the primary reason I use an additive like STP.
If you can find Rotella with a CI-4 or CI-4 plus rating, NOT CJ-4, it's the good stuff. However, it is getting difficult to find any CI-4 rated
oil these days.
The biggest issue I have with Brad Penn
oil is the hassle of having to order it online. I want an oil that is readily available at most local sources. Walmart Super Tech Universal oil, by the way, aint a bad call. Among the top performers is NAPA Universal Fleet Plus. While exotic oils like Redline are good, I'm watching the dollar per gallon cost as well as I use a LOT of oil for my "fleet". I like ONE brand, easy to get, at a decent price over "exoctic" oils.
If your just looking to service your Cobra only you can afford to be a little more picky, wait for an online order, pay a little more. I'm going to look into NAPA as Rotella CI-4 is getting impossible to find.
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3) It cast a healthy "specter of doubt" over the efficacy of ZDDP supplements.
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Well for me it didn't, there's a time and place to use an additive!