Hi all--
Can anyone tell me the proper thermostat temperature for an '85 300TD wagon?

When I bought me car I ordered a thermostat which, I believe, was 80 degrees. Didn't get around to putting it in right away, but when I had the car at the mechanic, I asked him to install it for me. He said, 'oh, your car really needs an 87 degree thermostat; I'll trade this one with you and put in the hotter thermostat.' So, I've been driving the car a long time with the 87 degree thermostat, and it's driving fine, but I was wondering:

1) Was he correct in putting in the hotter thermostat?

2) If not, is it damaging the engine to run a bit hotter?

3) Is there any advantage to running the car hotter.

TIA
Michael

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1985 300TD Wagon
Running biodiesel whenever I can get it!