Roy Butfoy gave me the following instructions when he rebuilt my box: ONLY use Castrol 80W90 Hypoy C, GL-5 oil. Change it once a year. If you do that, you will never have a problem. Been doing that for 20 years. I think Roy should know.
Pep Boys carrys Castrol.
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.