Shock oil update

[Glenn Mapes <gmapes@ball.com>]

After calling 15-20 motorcycle places trying to find 50 wt fork oil, what I 
found was that everyone stocks 10wt to 20/30 wt.  One place could special 
order 40 wt.  It seems there is no such thing as 50 wt fork oil.

Next question: would it be OK to use 50 wt SYNTHETIC oil?  I have always 
heard that using motor oil will cause the seals to deteriorate - is this 
true?

Again, any help will be appreciated.

TIA
Glenn Mapes <gmapes@ball.com>
1968 MGB