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I wouldn't do it personally, they slick 50 engine additive is not a good thing, (it has been documented too) and I would personally steer clear of anything that says slick 50 on it. But, like I said, i have no proof that there oils are not good,a nd in all reality, a diff is pretty forgiving too.
Even if it has that PTFE garbage in it, it is probably better than the 30 year old oil that was in it. I wouldn't worry about it too much.
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