{"product_id":"landnovo-engine-coolant-thermostat-11537642854-bmw-b58-m340i-540i","title":"LANDNOVO Heavy-Duty Engine Coolant Thermostat Assembly 11537642854 for BMW B58 3.0L 340i 540i 740i X3 X5 Supra A90 | Direct OE Replacement","description":"\u003cdiv class=\"landnovo-product-detail\"\u003e\n  \u003cp\u003eEliminate chronic coolant seepage, errant temperature sensor codes, and dangerous engine overheating with the \u003cstrong\u003eLANDNOVO Heavy-Duty Engine Coolant Thermostat Assembly (Part No. 11537642854 \/ 11-53-7-642-854)\u003c\/strong\u003e. Engineered specifically for \u003cstrong\u003eBMW B58 3.0L Turbocharged Inline-6 engine platforms\u003c\/strong\u003e (G20 M340i, G30 540i, G05 X5, and GR Supra A90), this electronic thermostat restores precision thermal regulation, reinforced structural sealing, and OE response rates at an accessible workshop-direct price.\u003c\/p\u003e\n\n  \u003ch3\u003eWhy Does the Factory B58 Thermostat Fail?\u003c\/h3\u003e\n  \u003cdiv style=\"background: #fef2f2; border-left: 4px solid #ef4444; padding: 12px 16px; margin: 15px 0; font-size: 14px; color: #7f1d1d;\"\u003e\n    \u003cstrong\u003eThe Common Failure Point:\u003c\/strong\u003e Under continuous high-temperature thermal cycling (105°C+), the factory plastic thermostat housing suffers heat embrittlement and micro-warping across the mounting flange. Concurrently, internal wax elements or electrical heater pins degrade, leading to stuck-open valves (causing low operating temp codes) or stuck-closed valves that cause catastrophic coolant boil-overs.\n  \u003c\/div\u003e\n\n  \u003ch3\u003eThe LANDNOVO Engineered Solution\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReinforced High-Temp Composite Housing:\u003c\/strong\u003e Constructed from advanced heat-stabilized polymers designed to resist cracking, flange warping, and pressure-induced coolant leaks under aggressive driving conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision Calibrated Electronic Actuation:\u003c\/strong\u003e Built with automotive-grade internal wax actuators and integrated electrical heating elements for pinpoint coolant temperature regulation matching factory DME parameters.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePre-Installed High-Temperature Viton (FKM) Seals:\u003c\/strong\u003e Outfitted with premium fluorocarbon gaskets that resist chemical degradation from modern ethylene glycol coolants and maintain long-term sealing memory.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e100% Direct Plug-and-Play Fitment:\u003c\/strong\u003e Manufactured strictly to factory BMW dimensions, matching coolant inlet\/outlet hose ports and 2-pin electrical harness plugs with zero wiring or bracket modifications.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eOEM Cross-Reference Part Numbers\u003c\/h3\u003e\n  \u003ctable style=\"width: 100%; border-collapse: collapse; margin: 15px 0;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n        \u003cth style=\"padding: 8px; border: 1px solid #ddd; text-align: left; width: 30%;\"\u003eOEM Interchange Numbers\u003c\/th\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\n          11537642854, 11 53 7 642 854, 11-53-7-642-854, 11538685984, 11538644558\n        \u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"padding: 8px; border: 1px solid #ddd; text-align: left;\"\u003eComponent Type\u003c\/th\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eEngine Coolant Thermostat with Integrated Housing \u0026amp; Sensor Port\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n        \u003cth style=\"padding: 8px; border: 1px solid #ddd; text-align: left;\"\u003eActuation Type\u003c\/th\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e12V Electronic \/ Map-Controlled Thermostat\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth style=\"padding: 8px; border: 1px solid #ddd; text-align: left;\"\u003eEngine Platform\u003c\/th\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW B58 (3.0L Turbocharged Inline-6 Petrol)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eComprehensive Vehicle Fitment Guide\u003c\/h3\u003e\n  \u003ctable style=\"width: 100%; border-collapse: collapse; margin: 15px 0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background-color: #0f172a; color: #ffffff;\"\u003e\n        \u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003eModel Years\u003c\/th\u003e\n        \u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eMake\u003c\/th\u003e\n        \u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel \u0026amp; Chassis\u003c\/th\u003e\n        \u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eEngine \u0026amp; Trim Details\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2016 – 2019\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e3 Series (F30 \/ F31 \/ F34)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e340i, 340i xDrive (B58 3.0L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2019 – 2024\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e3 Series (G20)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eM340i, M340i xDrive (B58 3.0L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2017 – 2023\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e5 Series (G30 \/ G31)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e540i, 540i xDrive (B58 3.0L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2016 – 2022\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e7 Series (G11 \/ G12)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e740i, 740Li xDrive (B58 3.0L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2018 – 2024\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eX3 (G01) \u0026amp; X4 (G02)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eM40i (B58 3.0L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background-color: #f8f9fa;\"\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2019 – 2024\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eBMW\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eX5 (G05) \u0026amp; X6 (G06)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003exDrive40i, sDrive40i (B58 3.0L)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2019 – 2024\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eToyota\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eGR Supra (A90 \/ DB42)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e3.0L Turbo Inline-6 (B58 Engine)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eWorkshop Installation Advisory\u003c\/h3\u003e\n  \u003cp style=\"background: #fdf6e2; border-left: 4px solid #f59e0b; padding: 12px; font-size: 14px; margin: 15px 0;\"\u003e\n    \u003cstrong\u003eTechnician Note:\u003c\/strong\u003e When replacing the thermostat on B58 engines, thoroughly clean the engine block mounting surface to remove corrosion and residual gasket scale. Lubricate the new seal with fresh coolant prior to seating. After installation, execute the electronic water pump automated bleeding sequence using a scan tool to purge air locks from the cylinder block before test driving.\n  \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Landnovo","offers":[{"title":"Default Title","offer_id":52372639744296,"sku":null,"price":68.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0979\/4243\/8184\/files\/1_fc232597-51db-40d1-a72c-37e201010a23.jpg?v=1789183989","url":"https:\/\/landnovo.com\/products\/landnovo-engine-coolant-thermostat-11537642854-bmw-b58-m340i-540i","provider":"Landnovo Premium Auto Parts","version":"1.0","type":"link"}