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CSF Race-Spec oil cooler for 2011–2016 BMW 135i/M135i (N55) uses a dual-core in-series design with an extra five rows of super-high-pressure multi-channel micro-tubes to increase heat rejection by roughly 40%. It’s a drop-in replacement that accepts OEM oil-line connections and brackets, increases required fill capacity slightly, and is engineered to maintain lower engine oil temperatures under extended high-load driving for track-oriented N55 applications.
CSF 11-16 BMW 135i(X) 5 Door F20 / M135i(X) 3 Door F21 Race-Spec Oil Cooler
