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If it hass one it`s alongside the oilfilter, it is a steel capp with a 19mm spannerhex onn, if it dont have one you take the oilfilter off and fill trou the bracet.
I was used to a 4712 with washable screen oil filters, and a big red filler cap on the timing gear.. When i went looking for the fill opening on a 6718 with spin-on filter, it took me quite some time