HD Expert Premium Extended Life Heavy Duty Diesel Coolant 16-834 – 50/50 Premix, Red, 3.78 L
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HD Expert Premium Extended Life Heavy Duty Diesel Coolant – 50/50 Premix, Red | 3.78 L
Part Number: 16-834
Brand: HD Expert / Recochem
UPC: 056438168348
Product Overview
A 50/50 pre-diluted extended-life heavy-duty diesel antifreeze/coolant using an ethylene glycol base with a low-silicate, nitrite-based HOAT (Hybrid Organic Acid Technology) additive package. Ready to use straight from the container — no additional water required. Formulated for demanding diesel cooling systems where wet-sleeve liner cavitation protection and long-service corrosion protection are required.
- Technology: Low-silicate, nitrite-based HOAT
- Color: Red
- Mix ratio: 50/50 premixed — ready to use
- Container size: 3.78 L
- Freeze protection: approx. -37°C / -34°F
- Boiling point: approx. 129°C / 264°F
- Service life: up to 6 years / 600,000 miles / 12,000 hours when properly maintained
- Phosphate- and amine-free
- Protects against wet-sleeve liner cavitation
Compatible Applications
- Heavy duty diesel engines specifying a nitrite-based HOAT extended life coolant
- Marine diesel inboard engines with closed cooling systems
- Caterpillar diesel engines (EC-1 spec)
- Cummins diesel engines
- Detroit Diesel / MTU engines (7SE298 / MTL 5048)
- PACCAR engines (CS0185)
- Perkins diesel engines
- Volvo Heavy Truck diesel engines
- Agricultural and stationary diesel equipment specifying HOAT red coolant
Important: Always confirm your engine manufacturer’s required coolant chemistry before use. This is a red, nitrite-based HOAT coolant — do not substitute based on color alone. Do not mix with OAT orange, conventional green, or other incompatible coolant chemistries, as this degrades the extended-life protection of both products.
Performance Standards
- ASTM D3306 / D6210
- CAT EC-1
- Cummins specification
- Detroit Diesel 7SE298
- MTU MTL 5048
- PACCAR CS0185
- JIS K2234
- TMC RP329
Service Interval
Rated up to 6 years / 600,000 miles / 960,000 km / 12,000 hours when properly maintained. Test coolant condition annually with a refractometer or compatible test strips. Replace earlier if testing shows depleted protection, contamination, or incorrect freeze-point.
Application Notes
- Pre-diluted 50/50 — add directly to a clean, flushed cooling system
- Do not add additional water or concentrate without adjusting the mixture ratio
- Flush the system thoroughly before switching from a different coolant chemistry
- Inspect hoses, clamps, and the heat exchanger or thermostat housing during coolant service
Related Part Numbers
- Concentrate version: 16-734 (not currently stocked)
- 9.46 L premixed version: 16-835 (not currently stocked)
Related Products
- Yanmar Genuine Coolant YG30R – Marine Diesel Engine Antifreeze
- Quicksilver Extended Life Coolant Antifreeze – 92-877770Q1
- RV & Marine Antifreeze -60°C | 3.78 L – 35-344AZWP
Parts Desk Insights
The most important detail with 16-834 is that it is a red nitrite-based HOAT diesel coolant — not an orange OAT product. Customers sometimes order by color alone, which leads to the wrong chemistry. For marine diesel applications, match the OEM coolant specification first. This product is a solid choice for older heavy-duty diesel platforms (Caterpillar, Cummins, Detroit Diesel) where HOAT extended-life coolants are specified. For newer or OEM-specific marine diesels, confirm the spec before recommending — engine-specific options like Yanmar YG30R or Quicksilver Extended Life may be more appropriate.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.