{"product_id":"lostar-heavy-duty-603-5403-coolant-overflow-reservoir-bottle-for-2008-2017-kenworth-peterbilt-trucks-t680-t800-w900","title":"LOSTAR Heavy Duty 603-5403 Coolant Overflow Reservoir Bottle for 2008-2017 Kenworth \u0026 Peterbilt Trucks | T680 T800 W900","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe LOSTAR Heavy Duty 603-5403 coolant overflow reservoir bottle is designed as a drop-in replacement for many Kenworth and Peterbilt trucks built between 2008 and 2017. In everyday driving, it helps capture excess coolant during heat cycles, aiding level maintenance and reducing spill risk on busy highways or long hauls.\u003c\/p\u003e\u003cp\u003eEngineered for durability, this bottle is specified to fit models powered by Cummins or CAT engines within the listed lineup. The rugged plastic construction is designed to withstand varied road conditions, temperature shifts, and regular servicing requirements.\u003c\/p\u003e\u003ch3\u003eKey compatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits 2008–2017 Kenworth and Peterbilt trucks as a direct replacement\u003c\/li\u003e\n\u003cli\u003eCompatible with Cummins or CAT engine configurations within the family\u003c\/li\u003e\n\u003cli\u003eIncludes cap for a complete, ready-to-install assembly\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign and build\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBrand new radiator overflow bottle with sturdy plastic construction\u003c\/li\u003e\n\u003cli\u003eDirect replacement that aligns with factory mounting points and hose connections\u003c\/li\u003e\n\u003cli\u003eBuilt to strict quality control standards to ensure consistent fitment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage and maintenance\u003c\/h3\u003e\u003cp\u003eIn daily use, it supports coolant level management during temperature cycles and simplifies routine checks thanks to a clear body design. It serves as a practical upgrade for aging reservoirs and for fleets managing spares.\u003c\/p\u003e\u003ch3\u003eMaintenance tips\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eInspect hose connections for wear during service intervals\u003c\/li\u003e\n\u003cli\u003eEnsure the cap seals tightly after installation to prevent leaks\u003c\/li\u003e\n\u003cli\u003eKeep an eye on reservoir level and replace as needed to maintain margins\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNote: The dealer part number N5346001 is replaced by this product when performing a straightforward swap, helping keep your cooling system operation consistent without requiring additional parts.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What vehicles is this reservoir compatible with?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Designed for 2008–2017 Kenworth and Peterbilt trucks, including common T680, T800, and W900 series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include a cap and is it a direct replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it includes a cap and is built as a direct replacement for the original reservoir.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"LOSTAR","offers":[{"title":"Default Title","offer_id":42464452542549,"sku":"B07M8LTSP9","price":182.1,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/lostar-heavy-duty-603-5403-coolant-overflow-reservoir-front-view.jpg?v=1777980783","url":"https:\/\/plentytorque.co.uk\/products\/lostar-heavy-duty-603-5403-coolant-overflow-reservoir-bottle-for-2008-2017-kenworth-peterbilt-trucks-t680-t800-w900","provider":"PlentyTorque","version":"1.0","type":"link"}