Ok, Ok....You win...

Go to the parts counbter at Mercedes-Benz of Fresno and ask them for a thermostat for a 617.950 engine. When they ask whether or not you want a 60°C or an 85°C, argue with them that it isn't the correct choice...Robert

Thats why they ASK what you want. :rolleyes: Geez, can you not get the point after a dozen posts of saying the exact same thing back-n-forth?
Its the same reason why oil change shops ask what type and weight oil the customer wants to use. It doesn't matter what the correct choice is if the customer wants differently.

Not really....

The 60°C is shown for high ambient temps and the 80°C is for lower ambient temperatures, so either one would be correct for the application (617.950) and the difference would be in ambient temeprature in the theatre of operation.

As far as oil is concerned, 15/40 will work in just about any climate...Robert

That is also incorrect.

http://www.peachparts.com//shopforum...chmentid=66675

Based on the chart you posted, 10w-40 or 10w-50 would work over the widest range of ambient temperatures...Robert