Mosselman BMW 335i E9x Single to Twin Oil Cooler Kit Extension
Keep BMW 335i oil temperatures under control with the Mosselman Twin Oil Cooler Extension Kit for the E9x platform. This proven cooling upgrade converts your existing single oil cooler setup to a twin oil cooler configuration using a Setrab 19-row auxiliary cooler and premium hardware. Ideal for N54 and N55 engines that see spirited road use, track days or operate in warm climates, this is the go-to BMW 335i oil cooler upgrade for reliability, consistency and performance.
Designed for BMW 3 Series 335i E9x owners seeking a robust oil temperature solution, this Mosselman oil cooler extension integrates a Setrab 19-row cooler with a dedicated left-side stainless bracket and hose kit to complete the twin cooler conversion. If you are searching for a BMW E90 oil cooler, BMW E92 335i oil cooler, N54 oil cooler upgrade or N55 oil cooler kit, this is the high-quality, track-capable choice enthusiasts trust.
Why choose this BMW 335i oil cooler upgrade
- Twin oil cooler conversion for enhanced heat management on BMW 335i E9x
- Setrab 19-row oil cooler for efficient, reliable cooling performance
- Recommended for warm climate use and track days to combat heat soak
- Engineered by Mosselman for N54 and N55 engines
- Popular BMW E90 E92 335i oil cooler solution for fast road and track
What’s included
- 1x Setrab 19-row oil cooler
- 1x Pre-assembled stainless steel bracket for the left side
- 1x Complete mounting bracket for the left cooler
- 1x Hose kit
Fitment and compatibility
- BMW 3 Series 335i E90/E91/E92 N54
- BMW 3 Series 335i E90/E91/E92 N55
If you are unsure whether this BMW E9x 335i oil cooler extension kit fits your vehicle, we offer a compatibility check before dispatch. Provide your registration number for UK cars or the last 7 digits of your VIN at checkout.
Installation notes
Not plug and play. Some adjustments to the vehicle are required to fit the larger oil cooler and bracket. Additional OEM components needed for installation:
- Oil cooler front air duct, left
- Wheel arch air duct, left
- Inside wheel arch for the auxiliary cooler, left
Proven by enthusiasts
We have fitted and used this Mosselman BMW 335i oil cooler extension on customer cars and feedback has been excellent. It is a favourite for track-day 335i owners and those tackling high ambient temperatures, delivering dependable oil temperature control and confidence on road and circuit.
Professional fitting available
For hassle-free installation, book professional fitting with Nforcd in Warwickshire. Request a quote: Sales@nforcd.com.
Part number
OCE9X.N5X.3
Manufactured by
Mosselman
Best for warm climate and track use
The twin cooler setup is recommended for cars regularly driven in high ambient temperatures and for vehicles used on track days where sustained oil temperature control is essential.
Search-friendly terms
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