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Originally Posted by BahnBurner
Does anyone know what the operating temperature range should be for a '94 SL600 with 109k miles?
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. . tell us what you are seeing on the temp gauge?? The fact that you asked probably means it higher than you think it should be???
To answer your question, MB states that the car will meet ALL specs at 80C or above. So that's probably the low end.
The upper side temperature can be most anything based on many variables; state of your radiator; mixture ratio of your coolant/water; aux fans operation; VFC operation to name the main 'players'. All of these contribute to keeping the engine temperature in a reasonable range.
My S500 cpe operates between 85C to 98C (w/ A/C on) depending on the weather and driving method.
Check out my web page's MENUs for some tips:
#17 for coolant mixture ratio
#18 for aux fans modification