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Description
Mosselman Oil Thermostat N55 (F-Series) with bolts and gasket sets / O ringsMosselman Turbo Systems is a Dutch manufacturer of high quality performance parts designed specifically for use in BMW and MINI cars. Mosselman has been in the tuning business for over 40 years and the vast majority of their products has been designed, tested and manufactured in house. If you own a BMW or MINI, they are a specialist in these makes. PRODUCT INFORMATION THE NEXT LEVEL OF TEMPERATURE CONTROL The N54, N55 and S55 engines are no strangers
Mosselman Turbo Systems is a Dutch manufacturer of high-quality performance parts designed specifically for use in BMW and MINI cars. Mosselman has been in the tuning business for over 40 years and the vast majority of their products has been designed, tested and manufactured in-house. If you own a BMW or MINI, they are a specialist in these makes.
PRODUCT INFORMATION
THE NEXT LEVEL OF TEMPERATURE CONTROL
The N54, N55 and S55 engines are no strangers to oil cooling problems, that’s why we recommend installing the MSL Oil Thermostat, especially for cars that are tuned. The standard oil temperature will reach around 120°C (250°F) with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85°C / 185°F) and will keep the temperature stable between 95 and 105°C (200 and 220°F), depending on the car model.
Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is equipped with a real thermostat, not an always open solution. The oil will still reach the operating temperature at the same time as a stock thermostat.
Installation instructions come with kit.
Suitable for F87 M2 Coupe (N55), F20 M135i Hatch, F22 M235i Coupe, F23 M235i Convertible, F30 335i Sedan, F31 335i Touring, F34 335i Gran Turismo, F32 435i Coupe, F33 435i Convertible and F36 435i Gran Coupe.
Note:You will need the N54 Oil Thermostat for the E-Series 135i and 335i with the N55 engine.
MSL OIL THERMOSTAT
A highly recommended upgrade for N54, N55 and S55 engines.
20°C Lower Than Stock Operating temperature 20°C lower than stock.
Rock Solid Housing CNC machined housing.
Real Thermostat Equipped with a real thermostat, not an always open solution (for use in hot and cold climates).
Quick Installation
The Thermostat is plug-and-play and made out of a solid block of high-grade aluminum at Mosselman's own facility. It is equipped with a real thermostat, not an always open solution. The oil will still reach the operating temperature at the same time as a stock thermostat.
Additionally to the thermostat, Mosselman have oil cooler kits for the 1-Series E8x and the 3-Series E9x. We advise the Oil Cooler Kit for cars that use the full performance of the car during track use. The kits are available as single or twin cooler kits. The single cooler kit replaces the OEM cooler on the right side of the car, the twin kit will add an extra cooler on the left side of the car.
EXPERT'S ADVICE:
"The N55 engine is no stranger to oil cooling problems, that’s why we recommend installing the MSL Oil Thermostat. The standard oil thermostat will reach around 120 degrees Celsius with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius) and will keep the temperature stable between 95 and 105 degrees Celsius, depending on the car model. Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is recommended to install the thermostat, especially for cars that are tuned.
The Thermostat is plug-and-play and made out of a solid block of high-grade aluminum at our own facility. It is equipped with a real thermostat, not an always open solution. The oil will still reach the operating temperature at the same time as a stock thermostat.
Note:The Oil Thermostat Installation kit prevents the Oil Thermostat from leaking and is highly recommended when installing the MSL Oil Thermostat. The kit includes 2 x O-ring for the oil hose and 1x rubber oil filter housing gasket. We advise to add it to your order."
MARK HENDRIKX - AUTOMOTIVE ENGINEER AT MOSSELMAN
FREQUENTLY ASKED QUESTIONS
Does the MSL Oil Thermostat have a real thermostat?
Yes, it is equipped with a real thermostat, not an always open solution. The oil will still reach the operating temperature at the same time as a stock thermostat.
Do I need new gaskets for the installation?
Yes, we highly recommend replacing the gasket and 0-rings to prevent the thermostat from leaking. We have an installation kit available, it includes 2 x O-ring for the oil hose and 1x rubber oil filter housing gasket. We advise to add it to your order.
Installation Time
The thermostat is plug-and-play, which means that you don't have to make modifications to install the thermostat. Just remove the old one and replace it with our MLS Oil Thermostat. The installation time will be approximately 30 minutes.
Models
1 Series / F20 (2012-2019) / M135i
2 Series / F22 / F23 (2014-2021) / M235i
2 Series / F87 M2 (2016-2021) / M2
3 Series / F30 / F31 / F34 (2012-2018) / 335i
4 Series / F32 / F33 / F36 (2014-2020) / 435i
Shipping Notes
Free Standard Shipping on $100+ Orders to the USA.
Except Preorder products are shipped in 48 hours.
Delivery to the USA:
Standard Shipping : 3-10 business days
If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
I love this robe. I bought it for myself as a Christmas present ( 2024) and it’s the best robe I have ever had. It’s soft, warm, long, and very comfortable. I’ve washed it several times over the past year and it still maintains its same quality, looking and feeling as brand new.
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Reviewed in the United States on December 16, 2025
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Verified Purchase
bobby
San Leandro, US
★★★★★ 4
Warm and comfy
Size: Adult, Style: Solid, Color: Black
Super soft, warm and comfy. I bought the adult size. I'm 5'11" and medium build. It's roomy and comes down to the middle of my shin. Typical robe style except that it does not open. It slips on like a shirt. May not be great if you have to go to the bathroom a lot. Otherwise awesome, I bought 2 for my sister's.
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Reviewed in the United States on November 25, 2025
F
Verified Purchase
Frau_Klink
Lowell, US
★★★★★ 5
Keeps me nice and warm in Alaskan winters!
Size: Oversize, Style: Solid, Color: Dark Purple, Size: Oversize, Style: Solid, Color: Dark Purple
As you've probably guessed from the title of my review, I live in Alaska. In my part of the state, the temperature gets down to as low as -25°F in the winter, so I decided to get this to help keep myself warm. (Part of it was self preservation; my mom flat-out refuses to turn the heat up past 69° F.) And it doesn't help that I have defective fat either. Apparently my body thinks I live in the Southern Hemisphere or something, because it keeps me warm in what would be winter for them, but is summer for me. The opposite happens in the winter for me. So I decided to bite the bullet and make the purchase...and let me tell you, this blanket/robe works MARVELOUSLY! It's so fluffy and warm, I rarely have to turn on my space heater anymore.
Now I'll admit, I was a little hesitant to bite the bullet because I'm a BBW, and most things labeled 'oversized' really aren't. (All my plus-size peeps out there know the struggle.) However, this blanket/robe is different! Not only does it fit, I have plenty of room to spare. For the record, I'm 5'6 1/2 - the half matters, trust me - and 321 lbs. But it's a little long...which is to be expected, since it's made for somebody up 6'5. So what I did to prevent mine from dragging was tie the belt underneath the pocket every time I need to leave my room, as seen in the picture. (Yes, I can still use the pocket during this time) That way, I don't have to sacrifice the extra room in favor of a shorter length. I also like how the sherpa is inside the hood as well. Between it and the elastic cuffs at the wrist, I could practically live in this blanket/robe!
I also purchased this in the adult size, but in dream blue. Again, I was nervous because I didn't know if it would fit me or not. Kinda felt like I was pushing my luck there. Fortunately, my fears were unfounded. Not only does it fit as well, I have a bit of room to spare. (See the last picture if you wanna compare the two sizes.) It's not as long as the oversized version, though. The adult size stops about halfway down past my knees, whereas the oversized can pool around my feet. It's not quite as roomy on me as the oversized one is either, but I bought it to walk around outside in, so that's a good thing. More room = more air getting inside to make me cold.
As of the date of this review, however, the slit no longer has the ability to snap closed on either of these robes. That was a bit of a bummer. But everything else is perfect, including the purple and blue being true to color. If you're on the fence about this blanket/robe, just do it! You'll be glad you did.
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Reviewed in the United States on November 5, 2024
T
Verified Purchase
Tiffany Zahn
Battle Creek, US
★★★★★ 5
Fire resistant saved my life!
Size: Oversize, Style: Solid, Color: Grey
Saved my life!
I love this snuggie. I'm 5'6" and the oversized drags when I walk. Its my outdoor fireplace blanket. Went to a neighbors last night and the fire tipped over towards me. Hot ash landed on my snuggie. After a stop drop and roll, the only thing damaged was my snuggie. Yes, I need to order another, but the material did great with fire.
On a normal night, it's warm and cozy and keeps me warm on chilly outdoor nights.
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Reviewed in the United States on May 25, 2026
T
Verified Purchase
Tracy
Battle Creek, US
★★★★★ 5
Luxury at its finest. Must have. You will not be disappointed!
Size: Twin(60" x 80"), Color: Tie-dye Coffee
This blanket is a must have! I purchased several to compare and decide which one was going to make the cut. There was absolutely no competition. This is the softest, most luxurious, coziest and authentic looking blanket. I told my sweetheart THIS is the cozy time blanket! Luxury at its finest! I have real vintage for jackets that are extremely luxurious and this rivals them with a clear conscience!Absolutely stunning and extremely high class feeling and appearing. Also semi-heavy and very warm . Upgrade to any space
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