> on the back of the block about oil filter level to the drivers side of
> the filter, about 1-1/4 inches across with a 17 or 19 mm hex head.
> Chip

19, IIRC. was able to get it off the first time 3 yrs ago. couldnt do it
again this time. ended up draining, refilling, ran the car...drained, then
refilled again. 50/50 orange prestone and distilled. radiator core still
looked brand new. wasted bout 3 qts worth of the stuff from the drain and
refill, but i know the mix is right and fresh. the temp gauge is even down
about 2 notches from center now.

the bolt is a major pain in the ass to take off, even with the oil filter
below it off.