I need some help here, I need to change my oil but I can't figure out what size wrench to use on the drain plug. It seems like everything I try is either too big, or too small. An 8mm was too loose, but a 9mm was too big. Had the same problem with SAE, it was either too big, or too small. Anyone know what size I actually need?

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06 KJ CRD - Hers
02 WJ - His
www.quadrapaws.org

On my first change I put in a Fomoto so mine is not worn. I just tried and it's a perfect 8mm with a good quality wrench

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)