Thermostat housing O-ring

[ac427]

Think it comes with the thermostat:

https://www.fcpeuro.com/products/bmw-thermostat-11531318274?ads_cmpid=352576039&ads_adid=229724073 19&ads_matchtype=&ads_network=g&ads_creative=8521 8 275839&utm_term=&ads_targetid=pla-85603299244&utm_campaign=&utm_source=adwords&utm_m edium=ppc&ttv=2&gad_source=1&gclid=CjwKCAjwqMO0BhA 8EiwAFTLgIM8jdN_S45dFYEQ1N6wonSKKq_Mx3KIvVpJRaYcqs b1mikfaxp7K-BoCa2cQAvD_BwE

Here are some individual ones, where ECS is saying BMW DOESN"T supply an oring with the thermostat:

https://www.ecstuning.com/BMW-E46-M3...mostat/O-Ring/

Thanks Mate but it is actually the O-ring for smaller diameter end for the thermostat, as shown here: https://youtu.be/JZs6DD8JUKY?t=532

[Stilt]

I've been watching several YouTube videos on S54 water pump replacement.

Apparently the thermostat housing has an O-ring that is not available as a spare part. The only way to get a new one is to buy a new housing.

Has anyone measured this O-ring or found a replacement for it?

Really, I never knew that; to be fair, I rarely ever from ecs/fcp; I buy all my parts via Worldpac and get them the same or the next day , which is super nice since the m3 is my daily.

If you really need a thermostat housing gasket, I have one right now that I thought I would need since I had dried coolant all over the bay (I pressumed I had a coolant leak and was going to replace all the gaskets b/c that's what I usually do lol), which turned out to be my rad having a hole in it.

[karter16]

Also available separately (note I'm not endorsing ECS tuning specifically, they just came up when I googled it)

https://www.ecstuning.com/BMW-E46-M3-S54_3.2L/Engine/Cooling/Thermostat/O-Ring/

[Tbonem3]

Think it comes with the thermostat:

https://www.fcpeuro.com/products/bmw-thermostat-11531318274?ads_cmpid=352576039&ads_adid=229724073 19&ads_matchtype=&ads_network=g&ads_creative=8521 8 275839&utm_term=&ads_targetid=pla-85603299244&utm_campaign=&utm_source=adwords&utm_m edium=ppc&ttv=2&gad_source=1&gclid=CjwKCAjwqMO0BhA 8EiwAFTLgIM8jdN_S45dFYEQ1N6wonSKKq_Mx3KIvVpJRaYcqs b1mikfaxp7K-BoCa2cQAvD_BwE

Here are some individual ones, where ECS is saying BMW DOESN"T supply an oring with the thermostat:

https://www.ecstuning.com/BMW-E46-M3-S54_3.2L/Engine/Cooling/Thermostat/O-Ring/

[ac427]

I've been watching several YouTube videos on S54 water pump replacement.

Apparently the thermostat housing has an O-ring that is not available as a spare part. The only way to get a new one is to buy a new housing.

Has anyone measured this O-ring or found a replacement for it?