LOSTAR Heavy Duty Coolant Overflow Reservoir Bottle Tank - Truck

In this review the LOSTAR Heavy Duty coolant overflow reservoir is assessed for heavy truck owners who need a straightforward, direct replacement for 2008-2017 Kenworth and Peterbilt models. The bottom line: this is a practical, low-cost replacement that fits a wide range of Kenworth/Peterbilt models with Cummins or CAT engines and includes the cap, making it a useful option for fleet mechanics or owner-operators seeking a fast swap. The review focuses on fit, build, installation, and real-world durability based on reported owner feedback.

Key Features

• Fitment: Covers many 2008 - 2017 Kenworth and Peterbilt models so buyers can replace the reservoir without extensive fit checks.
• Engine compatibility: Designed specifically for trucks with Cummins or CAT engines, helping ensure correct sensor and hose locations.
• Replacement part: Direct replacement for dealer part number N5346001, simplifying ordering for repairs.
• Included cap: Ships with a cap so the unit is ready to install and return to service without sourcing additional parts.
• Construction: Molded plastic construction keeps weight down and simplifies installation while meeting basic quality control standards.
• Value: Positioned as a cost-effective option that many customers report offers good value for routine maintenance.

Who It's For

The LOSTAR reservoir is best for Kenworth and Peterbilt owners, fleet maintenance shops, and independent diesel mechanics who need a direct-fit, affordable replacement for cooling system overflow on 2008-2017 models. It is particularly suitable when the original reservoir is cracked, leaking, or the cap is missing and a quick, no-frills swap is required.

Those who should look elsewhere include owners who require OE-branded parts for long-term heavy-duty usage or who need a reservoir for engines other than Cummins or CAT. Buyers concerned about long-term durability after mixed reports on lifespan may prefer factory or premium aftermarket options.

Pros & Cons

Pros

• Good fit across a wide list of Kenworth and Peterbilt truck models, reducing fitment guesswork.
• Includes the cap and replaces dealer part N5346001, streamlining repairs.
• Easy to install for a straightforward replacement, saving shop time.

Cons

• Mixed reports on sensor quality and long-term durability, so lifespan may vary by use and environment.

Specifications

Brand	LOSTAR
Fitment Years	2008 - 2017
Compatible Models	T660, T800, T880, W900, 335-389 series
Engine Compatibility	Cummins or CAT engines only
Includes	Reservoir bottle and cap
Replaces	Dealer part N5346001
Material	Plastic construction

Our Verdict

The LOSTAR Heavy Duty coolant overflow bottle is a sensible, budget-minded replacement for compatible 2008-2017 Kenworth and Peterbilt trucks with Cummins or CAT engines. It delivers reliable fit and easy installation for routine repairs, and the included cap is a practical touch; however, owners who need the highest long-term durability or flawless sensor performance may prefer OE or premium aftermarket options.

Frequently Asked Questions

Will this fit my Kenworth T680?
This unit is listed for many Kenworth models from 2008-2017; confirm compatibility for your specific year and engine type (Cummins or CAT) before ordering.

Does the reservoir include the cap?
Yes, the reservoir ships with the cap included so it is ready for installation.

Is the sensor included and reliable?
The bottle is designed to accept sensors used on these applications, but customer reports on sensor performance are mixed, so inspect sensor components during installation.