FWIW, My ZF drain plug at the end of last year's cruise-in season and ~2,300 miles. I change the gear oil at the end of every season no matter the mileage
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.