Mosselman MSL Twin Oil Cooler Kit for BMW 335i E9x - ultimate N54 N55 oil cooling upgrade
Keep your BMW 335i E9x running cool and consistent with the Mosselman MSL Twin Oil Cooler Kit. The N54 and N55 engines are renowned for high oil temperatures on spirited road drives, remapped cars and track days. This twin oil cooler upgrade uses quality Setrab cores and robust hardware to deliver reliable, stable oil temps and long-term engine protection. We have run this kit ourselves and customer feedback has been excellent for fast road and track use, especially in warmer climates and on tuned 335i builds.
Why choose this BMW 335i oil cooler upgrade
- Twin Setrab 19-row oil coolers for significantly increased oil cooling capacity
- Replaces the OEM right-side cooler and adds a second cooler on the left side for balanced, efficient airflow
- Pre-assembled stainless steel brackets and dedicated left-side mounting bracket for a strong, OE-like installation
- AN8 oil adapter and hose kit included for a clean, leak-free connection
- Ideal for tuned N54 and N55 engines, track days, spirited driving and warm climates
- Helps reduce heat soak and promotes consistent performance and engine longevity
Optional thermostat for optimal results
For best performance we strongly recommend pairing this kit with the Mosselman MSL 85c Oil Thermostat:
- Mosselman N54 Oil Thermostat 85c
- Mosselman N55 Oil Thermostat 85c
What’s included
- 2x Setrab 19-row oil cooler
- 2x pre-assembled stainless steel bracket
- 1x complete mounting bracket for the left cooler
- 1x Oil adapter AN8 - available in red and grey
- 1x Hose kit - 3 hoses
Fitment and installation notes
This kit is not plug-and-play. Some adjustments are required to fit the larger twin coolers and brackets. Approximate installation time is 4 hours. Additional OEM parts needed:
- Oil cooler front air duct - left
- Wheel arch air duct - left
- Inside wheel arch for the auxiliary cooler - left
Professional fitting is recommended. Nforcd offers in-house installation in Warwickshire - request a quote at Sales@nforcd.com.
Compatibility
- BMW 3 Series 335i E90/E91/E92 N54
- BMW 3 Series 335i E90/E91/E92 N55
Warm climate and track use
The twin cooler setup is recommended for very warm climates and cars that see regular track use.
Compatibility check before dispatch
To ensure a perfect fit we run a compatibility check prior to dispatch. Provide your UK registration number or the last 7 digits of your VIN at checkout.
Part number
OCE9X.N5X.2
Trusted by enthusiasts
We have installed and used this Mosselman MSL Twin Oil Cooler Kit on our own builds and customer cars with great results. Consistent oil temperatures, dependable hardware and premium Setrab cores make it a proven upgrade for performance-focused 335i owners.
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