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#10931386 - 06/21/15 11:49 AM Thermostat temps
Dognot Offline
TFF Team Angler

Registered: 01/20/10
Posts: 3240
Loc: N 31.531479 X W 99.640587
I changed thermostats in my 1996 Mercury 150. When I ordered them they came in 120 and 143 degree. I bought the 143, but I was wondering about this. why do they come in 2 different temp ranges?
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#10931465 - 06/21/15 12:45 PM Re: Thermostat temps [Re: Dognot]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2206
Loc: ft worth
143 is "normal" for most production V6's..(other than dfi's).. don't have a clue as ta why you would use a 120 on your type motor....Tha only V6 that I've seen that didn't have 143's is a 15" ProMax....it comes with 123's for whatever reason?

fixed it...don't do Opti's


Edited by TLW (06/22/15 02:53 PM)

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#10933193 - 06/22/15 01:59 PM Re: Thermostat temps [Re: Dognot]
wkh2006 Offline
Outdoorsman

Registered: 04/22/10
Posts: 222
Loc: Atoka, OK
Optimax 3.0 liter V6's prior to 2005 came with 120* thermostats mercury now recommends updating these engines to 130* stats. But for your particular engine the 143 is what belongs in it.

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