Best day of the week with the wind blowing south and the perfect buyer, all the older 80s diesel sedans, unless they're sub 10K miles, don't seem to command any more than 5K any more, typically less with a base value of 2.5K for anything that's not all ratted out. Those years have fallen into the abyss of just another old benz that isn't collectable yet.

You've got the CA thing working for you, but the market range is really limited, IMHO.