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I am sure there is a large number of manufacturers out there that sell similar additives but I guess I am looking for anyone who has tried something other than what is spelled out in the current TSB and worked?
Be careful. There is lots of snake oil out there. It's what they don't tell you that you may need to know. I would stick with additives tested, approved and recommended by GM.
What is LXE anyway? Is it compatible with synthetic lub? I could not find a spec sheet on this.