[Healeys] Oil For Healey's

[Steve]

Hello Fellow Healeyoids,
            I read some time ago that Casterol was making a 20W 50W
engine oil titled "For Collector Cars" and contained ZDDP.  I've checked
Auto Zone, Checker Auto, Pep Boys and even Wal Mart but can't locate
any.  Has anyone seen it on the shelves and if so, any suggestions where
to find it?  Otherwise, I'm going to go with Casterol "High Mileage" 20W
50W which I hope has enough viscosity.
 
Thanks,
Steve Meyer
61 BN7