5twins, yes , the neutral trick, I've been doing it or if you can't take your front brake off, pump the forks up and down a few times. Yes, old oil and hi temps don't help.
Also, I used the oil breather baffle from the 75 in my 72. I also used the dipstick from the 75. So far only a few drips from the breathers and the oil has not appreciably gone down.
Paul, thanks for the link. Not sure if the Mobil 10-60 is available in the US. I can get the Castrol at Advance Auto and it ain't cheap, but not sure if it has ZDDP in it like the Mobil. Did you check out Smedley's oil filter conversion?