Steven X. Schwenk theorized:
>
> Is this an old already rejected theory?  Wouldn't running the engine say
> 10% cooler...or any cooler than stock set up, have some adverse
> consequences?

I replaced my 87c thermo on my '90 vanagon with a 80c degree
thermostat. I haven't noticed any adverse affects. Does not make
very much of a difference, except during freeway cruising, temp needle
stays a bit lower than it used to.
Oil temperature seems to stay a bit lower too. Fuel mileage is the same.
In stop and go traffic, temp rises until fan goes on, as before.

I think I'll keep this thermo setup.
Harald
'90 westy