Interesting replies, thanks. I'm just not sure what is in my engine builds, I bought the cars with a 427 Fontana and the other 417. Always used this Castrol GTX 20w 50 as shown and never noticed this "Classic" version before.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.