AROS GROUP LTD
MMX Low Temperature Oil Thermostat for BMW N54/N55 (2008-on) Oil Cooler Thermostat Upgrade for 135i 335i 535i M135i M235i 435i Z4 35i
MMX Low Temperature Oil Thermostat for BMW N54/N55 (2008-on) Oil Cooler Thermostat Upgrade for 135i 335i 535i M135i M235i 435i Z4 35i
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
Couldn't load pickup availability
Keep your turbo straight six cooler and consistent
Push harder for longer with this cooler-opening oil stat designed for the 3.0 litre turbocharged straight six. By bringing the factory oil cooler into play earlier, it stabilises operating temps in the 90 to 110 C window under fast road and track-day use, helping protect bearings, turbos and seals while maintaining performance.
- Earlier oil-cooler activation for improved thermal control during spirited driving
- More consistent lap-to-lap performance and reduced heat soak
- Ideal for remapped, hybrid-turbo and high-boost builds
- Supports longevity by keeping viscosity and pressure more stable
- Great upgrade for fast road, drag, and circuit cars
Why upgrade your oil temperature control
The factory calibration prioritises rapid warm-up, which can allow oil temps to creep up when you are really leaning on the car. This performance oil thermostat lowers the opening point so the cooler works sooner, delivering tighter temperature control in demanding conditions without compromising everyday drivability.
Engine compatibility
Suitable for 2008 onward applications using the renowned 3.0 petrol twin-turbo and twin-scroll straight sixes commonly referred to as N54 and N55. Popular on 135i, 335i, 535i, Z4 35i, M135i, M235i, 435i and similar six-cylinder models. If you are unsure about fitment, contact us and we will be happy to help.
Note: models from 2008 onwards only.
Proven by us
We have installed this upgrade on customer builds and our own development cars with excellent feedback. Drivers report cooler, more stable temperatures in hard use and greater confidence when pushing on road or track.
Professional fitting available
For installation, choose the specialists. MJ Modifications, based in Warwickshire, offers in-house fitting and setup. Request a quote at info@mjmodifications.co.uk.
Search-friendly terms
oil thermostat upgrade, cooler oil temps, oil cooler control valve, performance oil stat, thermal management kit, track day cooling mod, fast road oil temp control, 3.0 turbo straight six cooling, 135i oil thermostat, 335i oil cooler upgrade, M135i oil temp solution, M235i cooling upgrade, 435i oil thermostat kit, 535i oil temperature control, Z4 35i oil cooler thermostat, E-series six-cylinder oil cooling, F-series six-cylinder oil cooling, tuned straight six cooling, stage 1 stage 2 stage 3 cooling support
Share
