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g300d 
Great write up thanks, gonna print off and keep it handy, if the lubricating doesnt work , will give removal a try and try to take pics too....out of curiosity what lube is best silicon, graphite spray, or just universal lubricant or wd40? originallly i think the latch had normal grease on it
PS had some luck finding a diy with pics, not sure if its the same for those with the facelift e53 though
BMW X5 Tailgate Latch Replacement (E53 2000 - 2006) | Pelican Parts DIY Maintenance Article