Description
The Mishimoto MMOC-GTO-04TBK is a purpose-built oil cooler kit engineered specifically for the LS-powered Pontiac GTO, pairing Mishimoto’s largest stacked-plate cooler with a CNC-machined adapter that bolts directly to the oil filter housing. A dedicated in-line thermostat, mounted under the headlight on its own bracket, keeps oil at a steady 185°F, while stainless steel braided -AN lines carry oil between the cooler and the engine. In testing with the thermostat removed as a variable, this Stealth Black finished kit produced a 65°F oil temperature drop, showcasing the raw cooling capacity of its 25-row core.
LS series engines are simple, powerful, and reliable, but sustained heat is still their enemy, and this Mishimoto oil cooler kit exists to keep GTO oil temperatures in check under demanding conditions. The 25-row stacked-plate, bar-and-plate core is mounted in the upper kidney grille for optimum airflow, delivering serious cooling capacity while the CNC-machined LS1/LS2 oil adapter and application-specific mounting brackets keep installation clean and direct-fit. Because tight factory clearances ruled out a thermostatic sandwich plate, Mishimoto engineered a standalone in-line oil thermostat instead, so oil only routes through the cooler once it needs to, minimizing pressure drop while adding roughly 1.0 qt of additional oil capacity. Every Mishimoto Cooling product in this kit, from the oil cooler to the fittings, is backed by the Mishimoto Lifetime Warranty.
Vehicle Applications
This oil cooler kit is a direct fit for the 2004-2006 Pontiac GTO, engineered around the GTO’s specific engine bay layout, oil filter housing, and grille packaging so the cooler, adapter, lines, and thermostat bracket all install without modification.
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 65°F (recorded without the in-line thermostat installed)
- Mishimoto In-Line Oil Thermostat maintains an optimum 185°F oil temperature
- Minimal pressure drop through the system
- Application-specific mounting brackets for a clean, direct-fit installation
- Includes CNC-machined, application-specific Mishimoto LS1/LS2 oil cooler adapter
- Pre-made stainless steel braided oil lines with durable -AN fittings
- Increases oil capacity by 1.0 qt
- Available in Stealth Black finish
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMOC-GTO-04TBK
- Color/Finish: Black, Anodized
- 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: Black
- Grade Type: Performance
- Inlet Fitting Type: AN Flare, Male
- Outlet Fitting Type: AN Flare, Male
- Engine Codes: LS-1, LS-2
- Chassis Code: V-Body
- Includes: Application-Specific Mounting Brackets, 25-Row Oil Cooler, Mishimoto In-Line Oil Thermostat, In-Line Oil Thermostat Mounting Bracket, Mishimoto LS1/LS2 Oil Cooler Adapter, stainless steel braided hoses with -10AN fittings, Banjo Fitting w/ Bolt M20 x -10AN (Black), M20 x -10AN Straight Fitting (Black), Mounting Hardware Set, and Mishimoto Lifetime Warranty
Frequently Asked Questions
Which vehicles does this Mishimoto oil cooler kit fit?
It is a direct fit for the 2004-2006 Pontiac GTO.
How much does this oil cooler lower oil temperature?
During testing, with the in-line thermostat not installed so it wouldn’t act as a regulating variable, the kit produced a 65°F oil temperature drop.
What temperature does the in-line thermostat maintain?
The Mishimoto In-Line Oil Thermostat is designed to keep oil at approximately 185°F.
Where does the oil cooler mount, and why isn’t a sandwich plate used?
The 25-row cooler mounts in the upper kidney grille for optimum airflow. Tight space restrictions in the GTO eliminated the possibility of using a thermostatic sandwich plate, so Mishimoto instead uses an In-Line Oil Thermostat that mounts under the headlight via its own direct-fit bracket.
What’s included in the kit?
The kit includes application-specific mounting brackets, the 25-row oil cooler, the Mishimoto In-Line Oil Thermostat and its mounting bracket, the Mishimoto LS1/LS2 oil cooler adapter, stainless steel braided hoses with -10AN fittings, a banjo fitting with bolt (M20 x -10AN, black), an M20 x -10AN straight fitting (black), and mounting hardware.
Does this oil cooler kit come with a warranty?
Yes, it is backed by the Mishimoto Lifetime Warranty.
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.
