VW 504/507

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I wish I could give you more information, but it's hard to come by and I've spilled all the beans I had.
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From what I heard, VW 504/507 has a sulphated ash limit of 0.5%. TBN appears to generally be around 5-6, which is pretty low. I can only presume that these formulations work very well with the latest engines that were designed with this type oil in mind, but as I said, I doubt that backwards compatibility implies that these new oils are ideal for other engines.
 
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