Oil Cooler Kit – Fits Mercruiser CMD QSD 2.8L & 4.2L Diesel (Replaces 879194185)
Oil Cooler Kit – Fits Mercruiser CMD QSD 2.8L & 4.2L Diesel (Replaces 879194185) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Oil Cooler Kit – Fits Mercruiser CMD QSD 2.8L & 4.2L Diesel (Re...
Product Details
This high-performance Oil Cooler Kit is designed for Mercury Mercruiser CMD QSD 2.8L (170–230 HP) and 4.2L (270–350 HP) diesel engines manufactured between 2005 and 2010. It ensures optimal engine temperature by effectively cooling the oil, which is critical for engine longevity and performance.
This kit serves as a direct replacement, providing an interchange for Mercury/Mercruiser part number 879194185.
- Engineered for direct OEM-replacement installation.
- Specifically designed for use in diesel engine applications.
- Includes the core oil cooler assembly required for replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury / Mercruiser | 879194185 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Mercruiser owners, please verify your engine's model and serial number range to ensure a perfect match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | CMD QSD 2.8 EI 170 | 170 | 4-Stroke | 2005–2010 | 879194185 | Serial #88300000 THRU 88300099 |
| Mercury | CMD QSD 2.8 EI 210 | 210 | 4-Stroke | 2005–2010 | 879194185 | Serial #88305000 THRU 88305102 |
| Mercury | CMD QSD 2.8 EI 220 | 220 | 4-Stroke | 2005–2010 | 879194185 | Serial #88300000 & Up |
| Mercury | CMD QSD 2.8 EI 230 | 230 | 4-Stroke | 2005–2010 | 879194185 | Serial #88310000 THRU 88310153 |
| Mercury | CMD QSD 2.8 ES 170 | 170 | 4-Stroke | 2005–2010 | 879194185 | Serial #88300400 THRU 88300453 |
| Mercury | CMD QSD 2.8 ES 210 | 210 | 4-Stroke | 2005–2010 | 879194185 | Serial #88305400 THRU 88305798 |
| Mercury | CMD QSD 2.8 ES 220 | 220 | 4-Stroke | 2005–2010 | 879194185 | Serial #88300000 & Up |
| Mercury | CMD QSD 2.8 ES 230 | 230 | 4-Stroke | 2005–2010 | 879194185 | Serial #88310400 THRU 88310997 |
| Mercury | CMD QSD 4.2 EI 270 | 270 | 4-Stroke | 2005–2010 | 879194185 | Serial #88400000 THRU 88400999 |
| Mercury | CMD QSD 4.2 EI 320 | 320 | 4-Stroke | 2005–2010 | 879194185 | Serial #88405000 THRU 88416999 |
| Mercury | CMD QSD 4.2 EI 350 | 350 | 4-Stroke | 2005–2010 | 879194185 | Serial #88416000 THRU 88416999 |
| Mercury | CMD QSD 4.2 ES 270 | 270 | 4-Stroke | 2005–2010 | 879194185 | Serial #88401000 THRU 88404999 |
| Mercury | CMD QSD 4.2 ES 320 | 320 | 4-Stroke | 2005–2010 | 879194185 | Serial #88406000 THRU 88415999 |
| Mercury | CMD QSD 4.2 ES 350 | 350 | 4-Stroke | 2005–2010 | 879194185 | Serial #88417000 THRU 88419999 |
Technical Specs
- Product Type
- Oil Cooler Kit
- Installation
- Direct OEM Replacement
- Fuel Type
- Diesel
- Dimensions
- Height: 1.5 in, Width: 12.0 in, Length: 15.0 in
- Weight
- 0.20 kg (0.45 lb)
What’s in the Box
- 1 x OIL COOLER KIT (879194185)
Installation Notes
- Ensure the engine is completely cool and disconnect the negative battery terminal for safety.
- Position a drain pan beneath the existing oil cooler to catch any residual fluid.
- Carefully disconnect the oil lines and coolant hoses attached to the cooler.
- Remove the mounting bolts that secure the old cooler and take it off the engine.
- Thoroughly clean the mounting surface to remove old gasket material and grime for a proper seal.
- Position the new oil cooler, making sure any gaskets or seals are correctly aligned.
- Hand-tighten the new mounting bolts, then torque them to the manufacturer's specified value.
- Securely reconnect the oil lines and coolant hoses to the new cooler.
- Reconnect the negative battery terminal.
- Refill the engine oil and coolant to their recommended levels.
- Start the engine and diligently check for any leaks around the cooler and its connections.
- Monitor the engine temperature and oil pressure to confirm everything is operating correctly.
Troubleshooting & FAQ
How do I know if my oil cooler is failing?
Common signs of a failing oil cooler include a milky or frothy appearance in your engine oil (indicating coolant contamination), oil present in the cooling system's expansion tank, or persistent engine overheating despite a functional radiator and water pump.
Is this a complete kit with gaskets and bolts?
This product includes the main oil cooler assembly as shown. Depending on the condition of your existing hardware, you may need to source new gaskets, O-rings, or bolts separately to ensure a leak-free installation.
What is the difference between the EI and ES Mercruiser models?
The designations "EI" (Electronic Ignition) and "ES" (Electronic Shift) refer to different systems on the engine. For this part, compatibility is determined by the engine model and serial number. Please ensure your engine's details match the compatibility chart.
Can I use this cooler on an engine not listed in the compatibility chart?
We can only guarantee fitment for the specific engine models, years, and serial number ranges provided. Attempting to install it on an unlisted model is not recommended and would be at your own risk, as dimensions and connections may differ.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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