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      11-11-2019, 09:53 AM   #1
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Mosselman S55 Oil Thermostat.... Any Real World Experience With This Mod??

So I was messing around on the interweb and came across this S55 oil cooling upgrade product: Mosselman S55 Oil Thermostat. Kies Motorsports also did a video install of this part as well as part of their M4 GTS build video series as seen here. I searched here on the forums in this section, and a few others where I would expect this upgraded part to be discussed but did not find anything on it.

So does anybody have any real world experience with this oil cooling upgrade? The heat management on the S55 is already very good, so I would speculate any meaningful oil cooling gains would be during increased heat loading on the track (or in very hot climates). Does anybody have any independent data to back up Mosselman's claims of keeping engine oil 20 deg C (or 68 deg F) cooler over stock?
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Last edited by jmciver; 11-11-2019 at 02:48 PM..
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      11-11-2019, 03:46 PM   #2
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Quote:
Originally Posted by jmciver View Post
So I was messing around on the interweb and came across this S55 oil cooling upgrade product: Mosselman S55 Oil Thermostat. Kies Motorsports also did a video install of this part as well as part of their M4 GTS build video series as seen here. I searched here on the forums in this section, and a few others where I would expect this upgraded part to be discussed but did not find anything on it.

So does anybody have any real world experience with this oil cooling upgrade? The heat management on the S55 is already very good, so I would speculate any meaningful oil cooling gains would be during increased heat loading on the track (or in very hot climates). Does anybody have any independent data to back up Mosselman's claims of keeping engine oil 20 deg C (or 68 deg F) cooler over stock?
I have a hard time believing some of those claims but I wouldn't know because I never tried their thermostat. However the reason I have a hard time believing those claims are because the website you linked says F8X cars will reach 120 celsius in normal driving temps. 120c = 248f. I have NEVER reached past 220f, even with WOT runs over and over in California 100f summers. Typically in sport plus I will see temps around 190f - 200f.

The website also states that their thermostat will keep temps in-between 95c - 105c (203f-221f)... which seems exactly what my stock oil temps are at warmed up..
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      11-11-2019, 03:55 PM   #3
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I commented on Mosselman's FB page about real track experience with this thermostat, and they didnt reply
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      11-11-2019, 06:50 PM   #4
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Quote:
Originally Posted by JamesGames View Post
Quote:
Originally Posted by jmciver View Post
So I was messing around on the interweb and came across this S55 oil cooling upgrade product: Mosselman S55 Oil Thermostat. Kies Motorsports also did a video install of this part as well as part of their M4 GTS build video series as seen here. I searched here on the forums in this section, and a few others where I would expect this upgraded part to be discussed but did not find anything on it.

So does anybody have any real world experience with this oil cooling upgrade? The heat management on the S55 is already very good, so I would speculate any meaningful oil cooling gains would be during increased heat loading on the track (or in very hot climates). Does anybody have any independent data to back up Mosselman's claims of keeping engine oil 20 deg C (or 68 deg F) cooler over stock?
I have a hard time believing some of those claims but I wouldn't know because I never tried their thermostat. However the reason I have a hard time believing those claims are because the website you linked says F8X cars will reach 120 celsius in normal driving temps. 120c = 248f. I have NEVER reached past 220f, even with WOT runs over and over in California 100f summers. Typically in sport plus I will see temps around 190f - 200f.

The website also states that their thermostat will keep temps in-between 95c - 105c (203f-221f)... which seems exactly what my stock oil temps are at warmed up..
Yeah, I have not taken my F80 to the track yet either. But I agree that their "temperature math" did not seem to add up from a practical sense.....
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      11-12-2019, 08:36 AM   #5
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Seems like they are trying to fix something isn't broken. This car's cooling system is the most efficient and robust out of any car I've had before.
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      04-21-2020, 04:34 PM   #6
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Did anyone ever try this to see if the claims were true?
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      04-22-2020, 01:18 AM   #7
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I'm going to have one installed tomorrow.
I think the oil is supposed to run cooler with the unit.
I can report back here
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      04-22-2020, 01:32 AM   #8
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Quote:
Originally Posted by behindthen0thing View Post
I'm going to have one installed tomorrow.
I think the oil is supposed to run cooler with the unit.
I can report back here
Look forward to it
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      04-22-2020, 05:01 AM   #9
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Mosselman is a Dutch tuner with a lot and very long experience with BMW. This thermostat really works a lot better for track.
They also make and sell these: https://www.mosselmanturbo.com/en/up...-s55-620-750hp
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      04-22-2020, 12:40 PM   #10
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I have installed this thermostat on my M3 and I do see an difference in oil temperatures.
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      04-22-2020, 12:48 PM   #11
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Quote:
Originally Posted by chetrickerman View Post
I have installed this thermostat on my M3 and I do see an difference in oil temperatures.
But why did you install it? Were you seeing elevated oil temperatures on the track, or more specifically, dangerously elevated oil temperatures?
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      04-22-2020, 03:43 PM   #12
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Mines now installed. I don't have my car back yet but I took some data with the stock setup earlier and I'll see how it compares.

In general the stock oil temp floats between 200 to 221 depending on conditions. Got up to 150 about six minutes after startup and 4 km of driving.

I'll have more detailed information tomorrow

I saw the unit before it was installed and it's huge! It's a giant block of machined aluminium with the thermostat inside. Really nice looking peice.
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      04-22-2020, 07:38 PM   #13
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Eagerly waiting to hear!!!!
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      04-22-2020, 07:39 PM   #14
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Quote:
Originally Posted by chetrickerman View Post
I have installed this thermostat on my M3 and I do see an difference in oil temperatures.
What sort of difference are you experiencing? What’s the difference in temps?
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      04-23-2020, 05:49 AM   #15
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Alright, so I didn't get a chance to start from cold and dark.
Car had already been warmed up before I got there.

Yesterday the stock thermostat was keeping oil around 200- 226F depending on driving modes. This was a combo of neighborhood driving and 140 mph. 60 km of driving.

With this new piece my oil temp was kept between 190-200F no matter what driving mode which included 130 mph pulls and slow driving. 40 km of driving. Ambient temperature in the mid 60s both days

Overall it does seem to run cooler which I would think it's better for your turbos and if you were in a track condition it would lessen the heat load.

Definitely would change it again. Plus it's a beautiful piece.
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      04-23-2020, 06:19 AM   #16
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Quote:
Originally Posted by behindthen0thing View Post
Alright, so I didn't get a chance to start from cold and dark.
Car had already been warmed up before I got there.

Yesterday the stock thermostat was keeping oil around 200- 226F depending on driving modes. This was a combo of neighborhood driving and 140 mph. 60 km of driving.

With this new piece my oil temp was kept between 190-200F no matter what driving mode which included 130 mph pulls and slow driving. 40 km of driving. Ambient temperature in the mid 60s both days

Overall it does seem to run cooler which I would think it's better for your turbos and if you were in a track condition it would lessen the heat load.

Definitely would change it again. Plus it's a beautiful piece.
Thanks man it’s on the list for me to do
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      04-23-2020, 06:28 AM   #17
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I've taken some long drives like 1200 miles in the summer I remember my oil getting above 240 or so.

I bet this would prevent that.

If you coupled this with an oil cooler you'd be golden.
I'll do some more driving and let you know anything else I observe
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      04-23-2020, 07:05 AM   #18
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It is good to see you getting positive results that appear to indicate this hardware is doing what it is supposed to do. Although, you may get some scrutiny from some of the more hardcore/track enthusiast regarding the testing method you used, using only the OEM oil gauge. Data logging oil temps (along with other critical parameters like engine coolant temp) with an app like BM3 would be beneficial - especially on track data.

All that notwithstanding, I still have to question the need for this mod given the overwhelming success of the F80's ability to maintain and control temperature in stock trim. Especially in harsh environments on the track, including race teams (amateur and professional) that use the stock oil cooling system apparently without issue. And I like mods like this.... In general, lower oil temps is better, however, oil is designed to work at optimal temperature bands, whether on the street or on the track. I am not a chemical engineer so I can't comment on the affect of the cooler oil temps on the effectiveness of the oil that is designed for the S55. But it is something to think about.

Hell, I wish there were a mod like this available for my E46 M3 back in the day as the E46 had a notorious reputation with overheating at the track, regardless of all the cooling mods that were created for it....
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      04-23-2020, 07:35 AM   #19
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Quote:
Originally Posted by jmciver View Post
It is good to see you getting positive results that appear to indicate this hardware is doing what it is supposed to do. Although, you may get some scrutiny from some of the more hardcore/track enthusiast regarding the testing method you used, using only the OEM oil gauge. Data logging oil temps (along with other critical parameters like engine coolant temp) with an app like BM3 would be beneficial - especially on track data.

All that notwithstanding, I still have to question the need for this mod given the overwhelming success of the F80's ability to maintain and control temperature in stock trim. Especially in harsh environments on the track, including race teams (amateur and professional) that use the stock oil cooling system apparently without issue. And I like mods like this.... In general, lower oil temps is better, however, oil is designed to work at optimal temperature bands, whether on the street or on the track. I am not a chemical engineer so I can't comment on the affect of the cooler oil temps on the effectiveness of the oil that is designed for the S55. But it is something to think about.

Hell, I wish there were a mod like this available for my E46 M3 back in the day as the E46 had a notorious reputation with overheating at the track, regardless of all the cooling mods that were created for it....

Yes the method I used wasn't particularly scientific but I tried to replicate as best I could the conditions. The gauge that I used it on the electronic steering wheel which gets it's data from the CAN bus, which would be the same source for a BM3 datalog.

I wish I would have done more testing with the stock system but I didn't have time. I decided to purchase it like a few days before It was installed so I don't have very much data comparatively.

For sure though it is running cooler than it was yesterday. I'll keep an eye on it and do some longer drives as well.
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      04-23-2020, 07:46 AM   #20
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Quote:
Originally Posted by behindthen0thing View Post
Yes the method I used wasn't particularly scientific but I tried to replicate as best I could the conditions. The gauge that I used it on the electronic steering wheel which gets it's data from the CAN bus, which would be the same source for a BM3 datalog.

I wish I would have done more testing with the stock system but I didn't have time. I decided to purchase it like a few days before It was installed so I don't have very much data comparatively.

For sure though it is running cooler than it was yesterday. I'll keep an eye on it and do some longer drives as well.
One other thing you could also take a look at is the cooling effectiveness of this mod in different drive modes. In stock trim the S55 cools the engine (both coolant and oil) more in Sport+ mode than the other modes. I have noticed Sport+ can cool oil temps by 20+ deg F over Sport & Efficient drive modes under certain conditions. But then the ECU is "smart" enough to only cool when necessary. For example, when in Sport+, the cooling delta is essentially non-existent on a cool day (below 45 deg F or so), but max delta temps are seen on hotter days, as expected.
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      04-23-2020, 08:07 AM   #21
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Quote:
Originally Posted by jmciver View Post
One other thing you could also take a look at is the cooling effectiveness of this mod in different drive modes. In stock trim the S55 cools the engine (both coolant and oil) more in Sport+ mode than the other modes. I have noticed Sport+ can cool oil temps by 20+ deg F over Sport & Efficient drive modes under certain conditions. But then the ECU is "smart" enough to only cool when necessary. For example, when in Sport+, the cooling delta is essentially non-existent on a cool day (below 45 deg F or so), but max delta temps are seen on hotter days, as expected.
yes, so yesterday in Efficient the water temp and oil temp both read 221F.
During driving I could get the oil up to 226 after pulling off the highway in efficient.

When going into sport plus the water dropped to 180 and the oil dropped to around 205-215.


I'll have better data tomorrow with the new thermostat because I had timed the opening and all that. i guess I could do a datalog as well.
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      04-23-2020, 08:09 AM   #22
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Quote:
Originally Posted by jmciver View Post
One other thing you could also take a look at is the cooling effectiveness of this mod in different drive modes. In stock trim the S55 cools the engine (both coolant and oil) more in Sport+ mode than the other modes. I have noticed Sport+ can cool oil temps by 20+ deg F over Sport & Efficient drive modes under certain conditions. But then the ECU is "smart" enough to only cool when necessary. For example, when in Sport+, the cooling delta is essentially non-existent on a cool day (below 45 deg F or so), but max delta temps are seen on hotter days, as expected.
I'm not seeing an oil temp channel in BM3.
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