Your best chance of finding something on this is to temporarily join "newspaper.com" or one of the other newspaper database websites. They usually give you 1 month free and then start charging $20 a month. The newspapers they have generally go back to the 1920s or so. Then do a search for "Mobil" and "Torture Test" together, and maybe something will pop up. Just remember to cancel your subscription before your trial is over,
The key to doing this is to have unique search terms. Searching just Mobil will give you a zillion different newspapers articles.
I've had very good luck using this source to find obscure information. It's likely they advertised this in newspapers somewhere.
