[s-cars] Rear main seal leak - try dino oil again?

[hoog23 at aol.com]

Last week I reported that my clutch was slipping.  Upon further inspection it appears to be the rear main seal that is leaking and causing clutch not to hold new RS2 power.
 
Currently running winter 5-40 synthetic.  Since its (supposed to be) springtime now I was going to switch back to mobil 1 15-50 synthetic.  But I noticed a case of old Penzoil 20-50 race oil left over from my old LT1 vette days (yes I should have kept that car).
 
Should I give the dino oil a go first in hopes of abateing the rear main leak?
 
I figure that I might as well try it as the case of penzoil will probably sit there another 10 yrs.
 
I noticed on 'two-guys garage' this morning (I have no life) that bars-leak has a rear main seal 'restorer' product that they used on an old T-bird.  But who knows what it would do inside a turbo?  
 
Dave
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