I agree with you Rob. It is a bull shit argument that DOT 3 / 4 is causing it. Some vendor is, as my wife says, "deflecting". This is right up there with the threads I see on MSD electronic boxes failing right out of the box. Cheaply made junk parts.
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.