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Description

BMW E9x N52/N54/N55 Mishimoto racing thermostat

The Mishimoto racing thermostat E9x is a thermostat that opens at a lower temperature than stock, for BMW N52, N54 and N55 engines. Once the engine is fully warmed up, the thermostat opens at 74 °C, so coolant flows through the engine sooner and engine temperature stays lower.

Especially on modified engines and on track, temperatures of an N52, N54 or N55 run high. According to Mishimoto, this racing thermostat significantly lowers those high engine temperatures and improves cooling efficiency throughout the engine. Two O-rings are included.

Key benefits

• Direct fit for BMW N52, N54 and N55 engines
• Opens at 74 °C, lower than the stock thermostat
• Coolant flows through the system sooner
• Lower engine temperatures, ideal for modified engines
• Two O-rings included
• Mishimoto Lifetime Warranty

Fitment

BMW with the N52, N54 or N55 engine

• Engines according to Mishimoto: N52, N54 and N55
• For example the 3 Series E90, E91, E92 and E93 with one of these engines
• Only with the factory plastic thermostat housing

Technical specifications

• Manufacturer: Mishimoto
• Part number: MMTS-E90-07
• Opening temperature: 74 °C (165 °F)
• Requires: factory plastic thermostat housing
• Included: 1 Mishimoto thermostat, 2 O-rings

Installation and delivery

The thermostat only fits the factory plastic thermostat housing. If your car still has a metal thermostat housing, Mishimoto states you first need BMW part 11537549476 or 11537601158. Before installation, carefully remove the metal pin from the Mishimoto thermostat with pliers before fitting it into the plastic housing. Mishimoto rates the installation as medium. Then fill and bleed the cooling system carefully. Lead time: 4 to 7 days.

A thermostat that opens earlier keeps your N52, N54 or N55 cooler when you need it most.

Why choose this Mishimoto racing thermostat E9x?

The stock thermostat is tuned for everyday use. Anyone tuning the engine or driving on track wants the coolant to start flowing sooner. This thermostat opens at 74 °C, fits the factory plastic housing and Mishimoto backs it with a lifetime warranty.

Frequently asked questions

Does this thermostat fit a metal thermostat housing?

No. The Mishimoto racing thermostat E9x only fits the factory plastic thermostat housing. With a metal housing you first need BMW part 11537549476 or 11537601158.

At what temperature does the thermostat open?

At 74 °C (165 °F), lower than the stock thermostat.

What is in the box?

One Mishimoto thermostat and two O-rings.

What is the lead time?

The lead time is 4 to 7 days.

Delivery outside the European Union: different shipping costs may apply. Don’t worry: we will email you as soon as possible after your order and agree the shipping with you. You are not committed to anything without your consent.