Change out the N55 Oil Filter Housing Gasket on your BMW with the least amount of mess in the shortest amount of time. While you’re at it, might as well upgrade to the Mosselman thermostat, but first let’s see if it delivers on what it promises during the test drive after replacing the oil cooler gaskets as well.

Mosselman Oil Thermostat F Chassis (N55): https://tinyurl.com/FN55Moss
Mosselman Oil Thermostat (S55): https://tinyurl.com/MossS55OC
Mosselman Oil Thermostat E Chassis (N55): https://tinyurl.com/MosEN55
Oil Cooler Gasket : https://tinyurl.com/FN55OCG
Oil Filter Housing Gasket: https://tinyurl.com/N20N55S55N54N52OFHG
8mm Wrench: https://amzn.to/4uRpMIh
11mm Magnetic Socket: https://amzn.to/4psX6Eo
Torque Wrench: https://amzn.to/3SkCrG2
Digital Torque Wrench: https://amzn.to/3T1lwUZ

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00:00 The problem
01:30 Essential Tools
01:53 Prep the car  
04:42 Coolant Drain
06:09 Remove the Oil Filter Housing
08:35 Clean the mating surface
09:09 How to identify a leak
09:40 Clean the housing
10:41 Install the Gaskets
11:35 Install the oil filter housing
13:10 Add in Oil HERE
13:26 Coolant Purge Process
13:56 Install Oil Filter Cap
14:06 Reinstall Intake Manifold
14:37 Reconnect charge pipe & O2 sensors
14:57 Run your final checks
15:35 Prime the engine
16:09 Does the Mosselman Thermostat Actually Work?
17:42 Recommendations