Mishimoto low-temp racing thermostat for the BMW M52 / M54 / M56 inline-six (E46, E39, E85 Z4, Z3, X3, X5). It begins opening at 70°C — about 27°C (48°F) earlier than stock — letting coolant flow into the radiator and shed heat sooner on modified engines. Pre-installed in a durable OEM-quality housing with gasket, backed by the Mishimoto Lifetime Warranty.
| Type | Low-temp racing thermostat w/ housing |
| Activation Temp | 70°C (27°C earlier than stock) |
| Engine | BMW M52 / M54 / M56 |
| Includes | OEM-quality housing + gasket |
| Part Number | MMTS-E46-99V2 |
| Warranty | Lifetime |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2006 | BMW | 323i/325i/328i/330i | Base / Ci / xi |
| 1999-2005 | BMW | 525i/528i/530i | Base |
| 2004-2006 | BMW | X3 | 2.5i / 3.0i |
| 2001-2006 | BMW | X5 | 3.0i |
| 1999-2002 | BMW | Z3 | Roadster / Coupe / M |
| 2003-2006 | BMW | Z4 | 2.5i / 3.0i / 3.0si |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
