CSF Aluminium Performance Radiator for BMW 1 Series 135i and 1M, plus E90/E92 335i Automatic
Unlock proven cooling performance and reliability with the CSF Aluminium Performance Radiator. This direct-fit, drop-in upgrade is engineered for BMW 1 Series 135i and 1M, and E90/E92 335i automatic transmission models. Built with CSF’s renowned B-Tube core and robust aluminium end tanks, it delivers significantly improved heat dissipation, strength and durability compared to the factory plastic-tank radiator.
- Drop-in fitment to E82 135i and 1M, plus E90/E92 335i automatic transmission models
- High performance aluminium core with CSF B-Tube design
- Aluminium end tanks replace weak plastic tanks to prevent cracking and leaks
- Designed and tested in the USA, with extensive validation at CSF production facilities
- Uses all factory shrouding, hose connections and mounting points
- Individually leak-tested and 30-point inspected before shipping
- Two year CSF warranty
Why upgrade to the CSF B-Tube aluminium radiator
CSF’s advanced B-Tube technology features two internal coolant tubes shaped like a B. This increases surface area for better heat transfer, improves rigidity for higher burst strength and allows for thinner, lighter material that is more efficient. Combined with a thicker core, this radiator offers excellent cooling headroom without unnecessary weight. By eliminating plastic end tanks and connections, it removes the common failure point of the OE radiator, especially on cars that see high temperatures and sustained use.
Quality and testing you can trust
CSF radiators are designed and developed in the USA, then validated with wind tunnel, vibration, thermal cycle, burst pressure and salt spray testing in Southeast Asia. Every unit is leak-tested and receives a thorough inspection for consistent, OE-level fit and finish. CSF is an OE supplier and private-label manufacturer for leading brands, so you get top-tier quality in a true bolt-in package.
Fitment
- BMW 1 Series
- E82 / E88 (08-13) 135i
- E82 / E88 (08-13) 135is
Also suits BMW 1M Coupe (2011) and E90/E92 335i automatic transmission models as a drop-in upgrade, using all factory hardware.
Note: The thicker core tightens tolerances, particularly between the expansion tank and accessory belt. This is not a fitment issue, but care is advised during installation.
Installation and support
We recommend professional fitting. Nforcd offers installation at our Warwickshire facility. For a fitting quote or to check compatibility for your specific BMW 135i, 1M or 335i automatic, email Sales@nforcd.com.
What our customers say
We have installed this CSF aluminium radiator on customer cars and the feedback has been excellent. Owners report more stable coolant temperatures and confidence in demanding conditions, with the added peace of mind that comes from ditching the brittle plastic end tanks.
Ideal for road and track
Whether you are refreshing cooling on a daily-driven BMW 135i, preparing a 1M for spirited driving or upgrading a 335i automatic that sees heavy use, this CSF radiator is a smart, reliable, performance-focused upgrade that keeps temps in check and maximises longevity.
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