Theres a simple chemical test that can be done to check for the presence of glycol in oil and it can be done on a small sample of oil- the car need not be present. If you live in or near a big city, such a place can be found in your Yellow Pages. Or, there are places that do this by mail-order.
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.