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I'm still unclear on the benefit. If the coolant temp with a stock thermostat is over 90*C, a lower-temp thermostat will not help; in both cases the thermostat is fully open and the coolant is over 90*C. If the coolant temp is below 90* then the car is well within its safe temp range for the engine. If the car's running hot I would suggest a product like Water Wetter might be what you're looking for. It reduces the surface tension of the coolant and enables the cooling system to move more heat into the coolant from the engine and into the radiator from the coolant.

[QUOTE="Daedalus, post: 1271314, member: 14388"] I'm still unclear on the benefit. If the coolant temp with a stock thermostat is over 90*C, a lower-temp thermostat will not help; in both cases the thermostat is fully open and the coolant is over 90*C. If the coolant temp is below 90* then the car is well within its safe temp range for the engine. If the car's running hot I would suggest a product like [URL="http://www.redlineoil.com/Products.aspx?pcid=10"]Water Wetter[/URL] might be what you're looking for. It reduces the surface tension of the coolant and enables the cooling system to move more heat into the coolant from the engine and into the radiator from the coolant. [/QUOTE]

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