M60 T-Stat, use 95C or 85C one?

[bubba966]

Can't say I'm too happy with the M60 using a 95C stat as that seems a bit high to me. Wondering if BMW has a lower temp stat I found one available for the M60 Gulf Version that's an 85C stat (part #11531729720).

Anybody use the 85C stat in their M60? If so, how's it run? And is the software in your car stock or not? Having the 93 octane E.A.T. software in the car and seeing how much more power that produces I can't help but think that the 85C stat would be a good idea. Should help the cooling system last a little longer as well I'd think.

I'd just buy one and try it, but the 85C stat costs about 4x what the 95C stat does. So I don't really feel like going out and dropping $100 on the 85C stat just to find out it's not a good idea...

[yaofeng]

I don't even remember what I used. But based on your description of the price differential I must have installed the cheaper one. I don't seee anything wrong with it.

[winfred]

the 95 should be ok, it's cooler then the later v8 thermostat, they went to a 105 and typically cycle between 228-236 when everything is working

[bubba966]

I'm not having any problems with the 95C one. But a cooler running engine should be easier on the cooling system. And as I've been having some of that crap out on me in the last week it's been making me think or a cooler stat.

Cooler running engine usually = more power, while a hotter running engine = better emissions. I could care less about the emissions as my car runs stunningly clean. Any slight drop in emissions from running a cooler stat wouldn't make any difference when the emissions test comes around.

Mostly wondering if the 85C stat factory cars had any other provisions for that stat temp. That's a lot bigger difference than the M50 stats that are 88C & 92C. S38 stat is 79C.

[yaofeng]

Hotter running engine has more power.

[mottati]

bmw bumped up the thermosat to help with the nikasil issues, cooler temps damaged the cyl walls more quickly. Should be fine with an alusil engine. The M cars run 79C thermostats (s38 and s62, maybe others).

[bubba966]

Hmm, maybe I'll give the 85C stat a shot as I've got an Alusil block that's in great condition.

[Fetch]

Hey there, I'm running the 85C thermostat on my M60 3.0, I posted the same question as you awhile ago when I noticed my water pump was about to blow up - and was surprised to find I had purchased an 85C thermostat partially accidentally...

Follow up, I'm enjoying the 85C thermostat on my car (nikasil)....I noticed _no_ change in MPG at all, car runs just as well as before....The temp needle hovers just below center with the 85C.

Go for it, Good luck!

[Jon K]

Hotter running engine has more power.

actually a colder running engine (between 165 - 185) has more power, but higher emission output.

[yaofeng]

Read this and tell me if you still think a colder engine has more power.

http://www.grc.nasa.gov/WWW/K-12/airplane/work2.html