MHX-215 High-Efficiency Oil Cooler

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  • Light-weight, compact, high-efficiency dual-pass oil cooler is 16% smaller, 5% lighter, and has 100% more fluid capacity than a 25-row, 4.5" wide core stacked plate oil cooler.
  • Ideal for cooling power steering, differential, transmission fluid or small engine oil up to 180 HP.
  • Similar heat rejection rates of larger 25-row stacked plate oil coolers yet has a lower air side pressure drop.
  • Female O-ring boss -10AN ports on same side of end tank.
  • Lifetime Warranty. Made in the USA.
Part # MHX-215

Improved Racing's Motorsport Heat Exchanger (MHX) series oil coolers are the result of several years of development and testing to create a highly efficient oil cooler. These coolers were perfected through extensive testing on our in-house heat exchanger test system and wind tunnel. 

The MHX-215 oil cooler is a dual-pass oil cooler that matches heat rejection rates of larger, heavier stacked-plate coolers made by brands such as Setrab, Mocal, and Earl's. This cooler is ideal for cooling transmissions, differentials, transfer cases, power steering, and small engines in a compact space. Compared to a typical 25-row, 4.5" wide core stacked plate cooler, this cooler is 16% smaller overall and 5% lighter, yet holds more than twice as much fluid volume. The core is 23% thinner and has a lower row and fin density, allowing more air to flow through the cooler to other heat exchangers (such as a radiator) behind it. 

A major design focus was to minimize welds and brazings to make these coolers stronger, lighter, and less prone to leaks. All four end caps are single-piece CNC-machined billet aluminum. The rows consist of laser-welded, thin-gauge aluminum tubes stuffed with turbulators to maximize heat transfer while minimizing weight. The dual-pass design also maximizes heat transfer efficiency. 

There are four M8x1.25 mm mounting holes, one on each corner of the cooler. Improved Racing has designed lightweight aluminum brackets (sold separately) to make mounting your cooler as easy as possible. The brackets feature integrated rubber isolators that protect the cooler from excessive vibration and extend the life of the cooler. 

The MHX 200-series coolers feature -10AN female O-ring boss ports on the same side of the end tank for convenient line routing. Optional fittings are available in -6AN, -8AN, -10AN, and -12AN JIC male flare threads. 

All Improved Racing oil coolers are pressure tested to 175 PSI to ensure no leaks and are rated for continuous operation at 150 PSI. Our coolers are made in the USA and backed by our Lifetime Warranty. 

MHX Oil Cooler End Caps
CNC-machined billet aluminum tank end caps with machined mounting holes on all four corners

Available ORB Fittings
3/8" or 1/2'' hose barb fittings or AN fittings in -06AN, -08AN, -10AN, or -12AN are available with the purchase of a cooler

Improved Racing MHX Oil Cooler Mounting Brackets
Vibration isolating mounting brackets available (sold separately)

Features and Benefits

  • Compact, lightweight design is 16% smaller, 5% lighter, and has 100% more fluid capacity than a 25-row, 4.5" wide core stacked plate oil cooler
  • Matches heat rejection rates of larger 25-row stacked plate oil coolers
  • Dual-pass design
  • Higher pass-through airflow rate than stacked plate coolers
  • Female O-ring boss -10AN ports on same side of end tank
  • 4x flanged M8 mounting screws are included
  • Lifetime Warranty
  • Made in the USA

Dimensions and Specifications


MHX-200 Series Oil Cooler Dimensions

Part # Rows Horsepower Range


(Total Height)


(Port Spacing)


(Port Offset)

Passes Fittings / Ports Weight Capacity Mounting Holes
MHX-215 15 120-180 HP 7.0 in (178 mm) 4.6 in (116.8 mm) 1.17 in (29.6 mm) 2 -10AN O-Ring Boss 1.9 lb (0.86 kg) 0.60 Qt (0.57 L) M8 x 1.25
MHX-221 21 160-250 HP 9.60 in (244 mm) 7.40 in (188.0 mm) 1.17 in (29.6 mm) 2 -10AN O-Ring Boss 2.5 lb (1.1 kg) 0.95 Qt (0.90 L) M8 x 1.25
Part #
Improved Racing
Part Weight
1.90 lb (0.86 kg)
Primary Material
Construction Type
Flat stuffed tube and fin
Number of Passes
Core Width
4.5" (114mm)
Core Height
7.0''' (178 mm)
Core Thickness
1.55" (39.4 mm)
Rows / Tubes
Fitting Size
-10AN Female O-Ring Port
Test Pressure
175 psi (12.07 bar)
Maximum Operating Pressure
250 psi (17.24 bar)
Maximum Operating Temperature
302°F (150°C)
Minimum Operating Temperature
-40°F (-40°C)
Fluid Compatibility
Engine oil
Gear oil
Power Steering Fluid
Transmission fluid
Fluid Capacity
0.60 Qt (0.57 L)
Mounting Hole Size
M8 x 1.25
Instruction Manuals
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