{"product_id":"lostar-coolant-overflow-reservoir-tank-for-2008-2017-kenworth-peterbilt-heavy-duty-plastic-direct-fit-oem-n5346001","title":"LOSTAR Coolant Overflow Reservoir Tank for 2008–2017 Kenworth \u0026 Peterbilt — Heavy-Duty Plastic Direct-Fit (OEM N5346001)","description":"\u003cp\u003e\u003cstrong\u003eThe LOSTAR Heavy Duty Coolant Overflow Reservoir (603-5403) is a direct-fit replacement coolant expansion tank engineered for 2008–2017 Kenworth and Peterbilt trucks with Cummins or CAT engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement overflow bottle is made from durable plastic and built to meet strict quality-control standards so you can restore proper coolant recovery and visible fluid monitoring without modifying existing plumbing. It replaces OEM dealer part number N5346001 and is designed to match the fit, mounting points, and hose connections used on many heavy-duty Kenworth and Peterbilt models shipped between 2008 and 2017.\u003c\/p\u003e\n\n\u003ch3\u003eWhich truck models and engines will this reservoir fit?\u003c\/h3\u003e\n\u003cp\u003eThis LOSTAR tank is specified for a broad range of Kenworth and Peterbilt vehicles produced in the stated model years. It fits trucks equipped with Cummins or CAT engines and matches the original mounting configuration for a simple swap.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible Kenworth and Peterbilt models from 2008–2017, including T660, T680, T800, T880, W900 and multiple W and legacy series.\u003c\/li\u003e\n  \u003cli\u003eSpecifically replaces OEM part N5346001 for a direct mount and correct hose alignment.\u003c\/li\u003e\n  \u003cli\u003eIntended only for trucks with Cummins or CAT powerplants—verify engine type before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does installation and fitment work for a quick replacement?\u003c\/h3\u003e\n\u003cp\u003eInstallation is designed to be straightforward for a technician familiar with coolant systems: unclip and drain the old tank, remove the mounting hardware, and transfer hoses and cap to the new unit. The replacement aligns with factory bolt locations and hose fittings to minimize downtime.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-replacement design, no cutting or drilling required.\u003c\/li\u003e\n  \u003cli\u003eUses original hose connections and cap thread to maintain system integrity.\u003c\/li\u003e\n  \u003cli\u003ePlastic construction reduces corrosion risk compared with metal alternatives.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and durability features does this reservoir offer?\u003c\/h3\u003e\n\u003cp\u003eThe tank is injection-molded from heavy-duty plastic formulated to resist heat cycles and automotive coolant exposure. Quality control checks ensure consistent wall thickness and sealing surfaces so the bottle maintains shape and leak-free performance under typical heavy-duty operating conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable plastic body engineered for thermal and chemical resistance.\u003c\/li\u003e\n  \u003cli\u003ePrecision-molded cap seat and hose bosses for reliable sealing.\u003c\/li\u003e\n  \u003cli\u003eManufactured to match OEM dimensions for consistent performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before purchasing to ensure correct replacement?\u003c\/h3\u003e\n\u003cp\u003eConfirm your truck’s model year and engine type (Cummins or CAT) and compare the OEM part number on your existing reservoir. Visual matching of mounting points and hose locations will help avoid fitment issues; contact your parts specialist if you see any differences.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify truck make, model, and year (2008–2017 coverage).\u003c\/li\u003e\n  \u003cli\u003eConfirm engine manufacturer (Cummins or CAT) for compatibility.\u003c\/li\u003e\n  \u003cli\u003eCheck existing overflow bottle for OEM number N5346001 where available.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The LOSTAR Heavy Duty Coolant Overflow Reservoir (603-5403) is aimed at fleet maintenance technicians, owner-operators, and repair shops that need a reliable, OEM-form-fit replacement for Kenworth and Peterbilt trucks built from 2008 to 2017. If you need a straightforward swap to restore coolant recovery and clear visible level monitoring—without modifying the vehicle—this replacement provides a cost-effective, durable solution that matches the factory layout for trucks running Cummins or CAT engines.\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: Will this reservoir fit my 2014 Kenworth T680 with a Cummins engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this LOSTAR tank fits 2008–2017 Kenworth T680 models equipped with Cummins engines as a direct replacement for part N5346001.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include the cap and mounting hardware?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The product includes the radiator overflow bottle and cap; verify if additional mounting hardware is needed for your specific truck before purchase.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"LOSTAR","offers":[{"title":"Default Title","offer_id":48082623004830,"sku":"B07M8LTSP9","price":174.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/lostar-front-view-reservoir.jpg?v=1785811680","url":"https:\/\/northtrailauto.ca\/products\/lostar-coolant-overflow-reservoir-tank-for-2008-2017-kenworth-peterbilt-heavy-duty-plastic-direct-fit-oem-n5346001","provider":"North Trail Auto","version":"1.0","type":"link"}