Long story short, my 98 E36 M3's lifters started to make a racket. I had ordered the Liqui-Moly Hydraulic Lifter Additive, but it took more than a month to ship, I switched to 5w50 and all seems well now, besides Vanos thumping. But anywho, since my lifters are nice and quiet now, I don't really see a need to add this. Mainly because I'm not sure what it is / does. Does anyone know, or have a report on the actual contents? I've used their MOS52 before, but this is not it. I can only assume it's not just a slightly heavier weight oil, like Lucas products seem to be. I've googled, and couldn't find a thing.