On vacation I saw a number of W116 on the big island, not all of them were rust free however
With the high cost of fuel over there a diesel makes sense if you want a big car to run over to Kilahuea or the East coast.
FWIW, I run a K&N RU1000 filter on one of the 300TD I own. Its a little work to get it right (with a air/oil separator) but worth it in my book!
DDH