Ahhhhhhhhhhhhhh .. a morning controversy .
At this point, it seems as if a synthetic 5-50 engine oil is best ....DO secure a consensus..
My idea , if you have a reservoir, is to use the wife's turkey baster to suck out as much as possible and then refill .. do this several times ..There is another recent similar thread on this ...Here, to renew the fluid, the transmission must be removed !