Mishimoto 15-20 BMW F8X M3/M4 Performance Auxiliary Radiator
Fits 2019–2021 BMW M2, 2015–2018 BMW M3 and more
All 6 applications- Authorized dealerGenuine Mishimoto parts, sourced direct
- 30-day returnsSee the return policy
- Diesel techs on the line908-223-9744, call or text
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Mishimoto 15-20 BMW F8X M3/M4 Performance Auxiliary Radiator
The 2015-2020 BMW F8X M3 and M4 rely on auxiliary radiators mounted low in the front corners of the car to keep the S55 in its operating window. Under sustained track use and aggressive street driving, the factory units run out of cooling capacity and heat-soak between runs - and their low position leaves them exposed to road debris and the plastic end tanks prone to cracking under repeated heat cycling. The Mishimoto Performance Auxiliary Radiator replaces the stock unit with a larger, fully reinforced aluminum core engineered to add thermal headroom and survive the conditions that retire the OEM part early.----The core carries 9% more volume and 32% more external tube area than stock, rejecting more heat into the airstream when the engine is working hardest. Strutted tubes reinforce the core against the vibration and impacts that fatigue a low-mounted radiator, while removable stone guard shields the exposed face from debris. Aluminum, TIG-welded end tanks replace the failure-prone factory components, and a robust bracket design fits both the driver and passenger-side locations from a single part.----Direct fit for the 2015-2020 BMW F8X M3 and M4 - installs in the factory auxiliary radiator location with no cutting, fabricating, or adapter work required. Backed by the Mishimoto Lifetime Warranty.
Installation Instructions- Built for back-to-back track sessions - the upgraded auxiliary radiator adds the cooling capacity the S55 needs to hold temperatures through sustained high-load driving, where the factory unit heat-soaks and gives up margin.
- Strutted tubes resist vibration and impact - internal tube reinforcement strengthens the core against the road vibration and debris strikes that fatigue a low-mounted radiator over time.
- 32% more external tube area for greater heat rejection - paired with a 9% larger core volume, the expanded core moves more heat into the airstream than the stock auxiliary radiator.
- Mounts on either side of the car - a robust bracket design fits both the driver- and passenger-side auxiliary radiator locations, so a single part covers either position.
- Confirmed direct fit for the 2015-2020 BMW F8X M3 and M4 - installs in the factory auxiliary radiator location with no cutting, fabricating, or adapter work required.
- No plastic tanks to crack - aluminum, TIG-welded end tanks replace the factory components that fail under repeated heat cycling and high-output use.
- Removable stone guard shields the core - protects the exposed face from road debris thrown up at the front of the car.
- Own it for life - backed by Mishimoto’s Lifetime Warranty, your investment is protected long after install day.
- Brand
- Mishimoto
- Part number
- MMRAD-F80-15A
- SKU
- MISMMRAD-F80-15A
- UPC
- 840197727294
- Category
- Radiators
- Weight
- 6.9 lb
- Shipping
- Ground, ships in 1 to 2 business days
- 2019–2021BMW M2
- 2015–2018BMW M3
- 2015–2020BMW M4
| Years | Make | Model | Submodel |
|---|---|---|---|
| 2019–2021 | BMW | M2 | Competition |
| 2020 | BMW | M2 | CS |
| 2015–2018 | BMW | M3 | Base |
| 2015–2020 | BMW | M4 | Base |
| 2019–2020 | BMW | M4 | CS |
| 2016 | BMW | M4 | GTS |
Applications are the manufacturer's published fitment for this part number.
Not sure it fits? Call 908-223-9744 or text us the year, model and engine. We confirm fitment before you order.
- Shipping
- In-stock parts ship in 1 to 2 business days. Tracking is emailed as soon as the label prints.
- Returns
- 30-day returns on unused parts in the original packaging. Return policy.
- Warning
- This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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Good to know
Questions, answered straight.
If it is not here, call or text the counter. Real people, real answers.
Fitment
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Will this fit my truck?
The Fits section at the top of the page lists the manufacturer's applications for this exact part. If your year, make and model is not there, or you are not sure, text us a photo of what you are replacing with your year and engine and we will confirm it before you order.
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What if I order the wrong part?
Call or text us before it ships and we will swap it. After delivery you have 30 days to return it in new, uninstalled condition. The return policy has the restocking details.
Shipping
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When will it ship?
In-stock parts usually ship within 1 to 2 business days from warehouses across the USA. The stock line under the options tells you the status of the part you are looking at. Large items ship LTL freight and we call to schedule delivery.
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Why did I only get part of my order?
We ship from multiple warehouses, so an order with several items can arrive in more than one box. Tracking for each shipment is emailed as it goes out. Full details in the shipping policy.
Returns and warranty
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What is the return policy?
30 days from delivery, in new and uninstalled condition, with a restocking fee. Everything is spelled out in the Returns & Refund Policy.
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How do warranty claims work?
We are an authorized dealer, so the manufacturer's warranty applies to every part we sell. Call or text us with your order number and we handle the claim with the brand for you.
Paying
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Can I pay over time?
Yes. Shop Pay installments are offered at checkout on qualifying orders, and the monthly estimate shows right under the price.
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What is a core deposit?
Some remanufactured parts, like injectors and turbos, carry a refundable core deposit. It is shown on the product page when it applies and refunded when your old part comes back to us.
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Call or text 908-223-9744 and you get a diesel tech, not a script.
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Authorized dealer
Genuine parts straight from the manufacturer, with the factory warranty behind them.
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Fast from stock
Most in-stock parts ship in 1 to 2 business days from warehouses across the USA.
Authorized dealer for 140+ brands
All brands
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- 30,000+ In-stock SKUs
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The shop floor, Nazareth, PAFull Send Diesel, Nazareth, PA
A team of diesel people, not a call center.
Full Send Diesel is a shop full of techs, builders and parts people in Nazareth, Pennsylvania. When you call or text, you reach someone who works on these trucks and knows the parts.
Not sure what you need? Send a photo of what you are replacing with your year and engine. We will point you to the right part, confirm it is in stock, and get it moving.
Mon–Fri, 8am–4pm ET. After hours, text or email and we answer first thing in the morning.
