The Toyota part # tells you the "centipoise" (new term for me
)
08816-03001 is 3000 cst (or some such anagram for centistokes or strokes or ?)
08816-10001 is 10,000 cst (much higher viscosity)
There used to be a 6000 also.
I drilled and tapped a small hole in the reservoir and sealed it with a little allen screw. I filled thru the pin hole as descibed above with 10,000 oil, replaced the pin (it really shoots out of there if you don't remove it first and fill thru the new hole; don't lose the pin!!), and then sealed the bleed hole with the little allen screw. Jury is still out for me; want to fiddle with it some more this summer when it's a little hotter.