Description
The Mishimoto MMOC-GTO-04T is a direct-fit oil cooler kit engineered specifically for the LS-powered 2004-2006 Pontiac GTO. Built around a massive 25-row stacked-plate core and a CNC-machined oil filter housing adapter, this kit was designed to solve the GTO’s biggest cooling weak point: rising oil temperatures under load. In testing, with the in-line thermostat removed from the equation so oil flowed constantly through the cooler, Mishimoto recorded a 65F drop in oil temperature, demonstrating just how much cooling capacity this stacked-plate design offers.
Because tight packaging around the GTO’s engine bay ruled out a traditional thermostatic sandwich plate, Mishimoto engineered a dedicated In-Line Oil Thermostat instead. Mounted under the headlight on its own application-specific bracket, this thermostat keeps oil regulated at an optimal 185F rather than allowing the cooler to run wide open at all times. The 25-row bar-and-plate core mounts in the upper kidney grille for maximum airflow, while pre-made stainless steel braided lines with -10AN fittings connect everything with minimal pressure drop. As a Mishimoto cooling upgrade, this oil cooler kit is purpose-built to keep GTO oil temperatures in check without the guesswork of a universal setup.
Vehicle Applications
This oil cooler kit is a direct fit for the 2004-2006 Pontiac GTO. It was designed and tested specifically around this platform’s LS-series engine and engine bay layout, from the CNC-machined oil filter housing adapter down to the application-specific mounting brackets for both the main cooler and the in-line thermostat.
Features
- Direct fit for the 2004-2006 Pontiac GTO
- 25-row stacked-plate oil cooler mounted in the upper kidney grille for optimum airflow
- Reduces oil temperatures by 65F (measured without the in-line thermostat installed)
- Mishimoto In-Line Oil Thermostat maintains an optimum 185F oil temperature
- Minimal pressure drop
- Application-specific mounting brackets for the cooler and in-line thermostat
- Includes CNC-machined, application-specific Mishimoto LS1/LS2 oil cooler adapter
- Pre-made stainless steel braided oil lines with durable -AN fittings
- Cooler available in Sleek Silver or Stealth Black
- Increases oil capacity by 1.0 qt
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMOC-GTO-04T
- Product Type: Cooling
- Core Type: Bar-and-Plate
- Core Row Quantity: 25
- Core Height: 7.32 in
- Core Thickness: 1.97 in
- Core Width: 11 in
- Core Color: Silver
- Finish: Anodized
- Grade Type: Performance
- Inlet Fitting Type: AN Flare, Male
- Outlet Fitting Type: AN Flare, Male
- Kit Includes: Application-specific mounting brackets, 25-row oil cooler, Mishimoto In-Line Oil Thermostat with mounting bracket, Mishimoto LS1/LS2 oil cooler adapter, stainless steel braided hoses with -10AN fittings (assorted lengths and fitting angles), M20 x -10AN banjo fitting with bolt, M20 x -10AN straight fitting, mounting hardware set, and Mishimoto Lifetime Warranty
Frequently Asked Questions
What vehicles does the Mishimoto MMOC-GTO-04T oil cooler kit fit?
This kit is a direct fit for the 2004-2006 Pontiac GTO.
How much does this oil cooler kit lower oil temperatures?
During testing, with the in-line thermostat removed to eliminate it as a variable, the kit produced a 65F drop in oil temperature.
How does the kit regulate oil temperature during normal driving?
Because tight space restrictions ruled out a thermostatic sandwich plate, the kit uses a Mishimoto In-Line Oil Thermostat, mounted under the headlight on its own bracket, to maintain oil at an optimal 185F.
What color options are available for the cooler?
The cooler is available in either Sleek Silver or Stealth Black.
What is included in the Mishimoto GTO oil cooler kit?
The kit includes application-specific mounting brackets, the 25-row oil cooler, the Mishimoto In-Line Oil Thermostat with its own mounting bracket, a Mishimoto LS1/LS2 oil cooler adapter, pre-made stainless steel braided hoses with -10AN fittings, a banjo fitting and bolt, an M20 x -10AN straight fitting, mounting hardware, and the Mishimoto Lifetime Warranty.
Does this kit affect engine oil capacity?
Yes, installing this oil cooler kit increases oil capacity by 1.0 qt.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
