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It must have been 22090, that one is listed as fully synthetic GL4/GL5 while 20012 is GL4+ (not sure what the difference is between GL4+ and GL4/GL5) I found a 3rd one on Amazon that is just GL5, but it doesn't show on the Liqui Moly site so I'm not sure on that one. I ordered 22090 so I guess I'll find out.
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