Short question to a Diesel expert... :o))

I own a 1982 westy with a 1.6 TD conversion. There is no leaks and the
compression is abour 450-475 for all cylinders. The oil consumtion is about
1 quart per 250 miles. I brought it to my mechanic and he told me that the
thermostat was keeping the engine running too cold. Causing this high oil
consumption. Probably a wrong thermostat. He ran it for about 150 miles
(He's a friend of mine :o), changed the termostat to make it run hotter and
made another 350 miles.After all that mileage (500 miles), it added about
half a quart of oil...
Does this too cold engine stuff makes sense?

Sylvain B�langer
Montr�al, Quebec.
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