Thanks, RPM ... noted the sticker ... had forgotten completely about it. Mine is 2.5 pounds (40 oz).
Pulled vacuum for an hour (had evacuated it last night for about 20 minutes and it held within an inch or so after 15 hours).
Charged with three 12 oz cans and got compressor ops after most of second can. So, guess am within 4 oz of recommended amount. Will wait till summer to add, if ops aren't normal.
With ambient temp in 40F range, stabilized after 36 oz at 32 psi low and 150 psi high. Appears to operate fine.
Thanks to all for the help!
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg