AIRTEC Motorsport Oil Cooler for BMW E9x M3

As part of our expanding BMW product range, AIRTEC Motorsport is proud to launch our replacement oil cooler kit for the E90, E92 and E93 M3 models, suitable for track or fast road use.

With huge experience in developing external oil cooler packages for a variety of modified track and road cars, we chose to create a direct replacement oil cooler with a larger core to make the most of the space available in the original location. 

As a result, our kit offers a huge capacity increase as well as improved cooling, thanks to a core that measures 79% bigger than the standard BMW oil cooler together with an increased frontal area of 17% over standard, which means there is more air flow passing through the core to help cool it. 

The oil cooler attaches to the original oil lines and is supplied with new O-rings and replacement bolts as well as detailed fitting instructions for a simple installation process.  

TESTED ON TRACK
In May 2025, we ventured over to the iconic Nürburgring in Germany to complete a two day, back-to-back test in order to collect data as part of the track testing programme for our newly developed E9x M3 cooling package; in particular the engine oil cooler DCT gearbox oil cooler. For this, we used our AIRTEC Motorsport demonstrator vehicle, which is equipped with an uprated exhaust system and sports cats, a remap, KW V3 suspension, AP Racing brakes and a semi-slick tyre set up, among other modifications and driven by this season’s Time Attack driver Alan Shepherd. 

The first day would entail a day of data logging with the standard coolers in place, before swapping over to our AIRTEC Motorsport coolers for the next day and repeating the same process.

Using the original oil cooler on the first day of testing saw oil temperatures exceed the 125-degree mark on the oil temperature gauge in the car, reaching a peak of 135 degrees centigrade later in the day, forcing us to call the day short and make the decision to change the oil in the car due to concerns over the oil degrading purely as a result of the high temperatures.

The oil temperature reading shown on the dash is measured from the sump. When testing on the second day, the ambient temperature was one to two degrees hotter, allowing us to have near identical test conditions. The oil gauge on the dashboard never exceeded 120 degrees, allowing us to complete more laps without the worry of oil degrading. 

When looking at the data gathered from the oil temperature sensors we had installed in the inlet and outlet of the oil cooler, we saw temperatures as high as 125 degrees at the inlet and as high as 110 degrees at the outlet, so only 15 degrees being taken out by the oil cooler. When compared to the data when fitted with our AIRTEC Motorsport oil cooler, the maximum temperature into the oil cooler was 123 and the maximum outlet temperature was 76 degrees, so 46 degrees of temperature pulled out of the oil, which is an impressive 205% more than the standard oil cooler was able to do. 

On average, the temperature decrease by the AIRTEC Motorsport oil cooler was double that of the original oil cooler. 

FULL VIDEO OF THE TESTING AVAILABLE ON OUR YOUTUBE CHANNEL HERE

Please note: 2007 or early 2008 models will require the original oil line connectors to be modified OR replaced. Please see the fitting instructions for more information. 

This cooler makes up part of BMW E9x M3 cooling package, which includes: 

• AIRTEC Motorsport Power Steering Cooler
• AIRTEC Motorsport DCT Cooler
• AIRTEC Motorsport Under Tray
• AIRTEC Motorsport Radiator

Features:

• Comprehensive kit designed specifically for the E9x M3 platform
• 79% larger core compared to standard 
• 17% increase in frontal area compared to standard
• Improved capacity and oil cooling ability
• Direct replacement that fits in original location
• Reuses original oil line fittings
• Includes new O-rings and fixtures 
• Features detailed fitting guide

AIRTEC part no: ATMSBMW17