# HP5826 Seastar (1/2" Oil) Power Steering Oil Cooler Replacement

The replacement SeaStar HP5826 oil cooler cools the hydraulic fluid in the engine driven power steering system. The heat exchanger requires a minimum 18 GPM rate of water flow but operates best around 27 GPM which is common flow for a crankshaft mounted seawater pump. This cooler's working pressure is 100psi and provides at 6.25kW or 8.4hp of cooling at minimum parameters.

MADE IN THE USA.

Specifications:

-   Water Line Size: 2"
-   Cooling Power: 6.25kW
-   Cooling body diameter 3"
-   Oil Pipe thread Size: 1/2" NPT
-   Minimum Water Flow: 18 GPM
-   Fluid/Oil Compatibility: HA5430H SeaStar Fluid or Dexron II ATF
-   1/4" BSPT - Zinc anode - Z09-032

This is a Mr Cool (USA) marine part MRC HP5826.

## Details

- **Price:** 990.0 AUD
- **Vendor:** Mr Cool
- **Tags:** Sawley’s AAM Aftermarket – Cooling Systems Mr Cool | Marine Heat Exchangers & Kits

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 990.00 AUD | In stock |

## Images

- HP5826 Seastar (1/2" Oil) Power Steering Oil Cooler Replacement
- HP5826 Seastar (1/2" Oil) Power Steering Oil Cooler Replacement
- HP5826 Seastar (1/2" Oil) Power Steering Oil Cooler Replacement
- HP5826 Seastar (1/2" Oil) Power Steering Oil Cooler Replacement

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/hp5826-seastar-1-2-oil-power-steering-oil-cooler-replacement)
> Updated: 2026-06-23