When a question like this arises, I usually ask whether the author is in the business of selling parts that offer a solution... This is one reason why The Diesel Page doesn't sell anything that you can use in or bolt onto your engine/truck.

If there was a persistent need for a "solution" to a problem with the Duramax (like the FSD/PMD 6.5 issue), we'd see the problem show up frequently in the Duramax forum and I'd get at least a few questions/discussions about that problem every month. We/I don't.... I've probably discussed the oil cooling/overheating topic in an email or phone only a couple of times in the past 7 years.

Jim