CSF F1X M5/M6 and F9X M5/M8 High-Performance Engine Oil Cooler - 8317

The CSF 8317 High-Performance Engine Oil Cooler is a purpose-built upgrade for BMW S63-powered vehicles, designed to replace the factory oil cooler on the F1X M5/M6, F9X M5/M8, and G9X M5. Developed in collaboration with Steve Dinan's CarBahn Autoworks — specifically to complement their S63 Stroker Kit — this cooler addresses two critical real-world problems: dangerously high oil temperatures on tuned and track-driven S63 engines, and the well-documented vulnerability of the OEM oil cooler's mounting position to front-end scrapes and bottoming-out. Whether you're chasing lap times or simply protecting a modified street car, the CSF 8317 is a meaningful, engineering-driven upgrade over the factory unit.

Key Features & Benefits

• Heavy-Duty Bar-and-Plate Core: Replaces the OEM's fragile tube-and-fin core with a far more impact-resistant bar-and-plate design — a critical improvement given the oil cooler's exposed, low-mounted position that makes it prone to damage on lowered cars or during track use.
• 33% Larger Core — 60mm vs. OEM 45mm: The thicker core adds three additional rows of oil cooling, dramatically increasing heat dissipation capacity. Oil capacity is also increased by 0.5 quarts (0.47L), helping buffer temperature spikes during extended high-load driving.
• TIG-Welded End Tanks: Unlike the factory's brazed construction, the CSF end tanks are fully TIG-welded for superior strength and leak resistance — a direct fix for one of the OEM unit's known failure modes.
• CNC-Machined Connection Blocks: TIG-welded to the core for extreme durability, these precision-machined blocks ensure the connections can withstand the abuse of sustained high-performance driving.
• OEM-Style Inlet/Outlet Connections: Drop-in fitment using factory-style quick-connect fittings means no custom plumbing or fabrication is required.
• Satin Black Finish: A clean, stealthy appearance that suits engine bay aesthetics on modified M cars.
• Individually Leak and Pressure Tested: Every unit is tested before shipment for peace of mind.
• 2-Year Limited Warranty: CSF backs this cooler with a 2-year limited warranty.
• Co-Developed with CarBahn Autoworks: The engineering collaboration with CarBahn ensures this cooler is validated for the extreme heat demands of the S63 Stroker Kit and high-power tuned S63 applications — not just a generic upgrade.

Specifications

• Part Number: CSF 8317
• UPC: 710353083178
• Core Type: Bar-and-Plate
• Core Material: Aluminum
• Core Thickness: 60mm (vs. OEM 45mm)
• Additional Oil Cooling Rows vs. OEM: +3 rows
• Additional Oil Capacity vs. OEM: +0.5 quarts (0.47L)
• Inlet/Outlet: OEM-style quick-connect type
• Finish: Satin Black
• Warranty: 2-year limited
• Package Dimensions (per retailer listing): 27.30" (L) × 10.20" (W) × 5.00" (H)

Fitment

The CSF 8317 is engineered specifically for BMW vehicles equipped with the S63 twin-turbo V8 engine, spanning multiple M chassis generations:

• BMW F1X M5 (F10 M5, 2011–2017)
• BMW F1X M6 — including M6 Gran Coupe (2014–2019)
• BMW F9X M5 (F90 M5, 2018+)
• BMW F9X M8 — including 2020 M8 Base
• BMW G9X M5 (per manufacturer fitment data)

This cooler is particularly well-suited for S63-powered cars running upgraded turbos, aftermarket tunes, or CarBahn's S63 Stroker Kit — applications where factory oil cooling capacity is most likely to be overwhelmed. CSF notes that the cooler's larger 60mm core may require trimming of the OE ducting and lower radiator cradle for best fitment. Factory mounting locations and hardware are reused; no additional mounting hardware is included. If you are unsure whether this cooler fits your specific build, contact ThreePiece.us before ordering.

What's in the Box

• CSF 8317 High-Performance Engine Oil Cooler (bar-and-plate core with TIG-welded end tanks and CNC-machined connection blocks)

Note: Factory mounting hardware is reused. No additional brackets or hardware are included in the box.

Why Buy from ThreePiece.us

• Free Shipping on Every Order: The CSF 8317 ships free — no minimum, no surprises at checkout.
• Affirm Financing Available: Spread the cost over time with Affirm financing, making it easier to invest in the cooling upgrades your S63 deserves.
• Expert Fitment Support: Not sure if the 8317 is right for your specific M5, M6, or M8 configuration? Our team can help verify fitment before you buy — reach out before placing your order.

Frequently Asked Questions

Q: Is this a true drop-in replacement, or does it require modifications?
A: The CSF 8317 uses OEM-style quick-connect fittings and factory mounting locations, making it a drop-in design. However, CSF does recommend trimming the OE ducting and lower radiator cradle to achieve the best fitment with the larger 60mm core. No additional mounting hardware is needed — factory hardware is reused.

Q: Does this oil cooler fit my F90 M5 with upgraded turbos or an aftermarket tune?
A: Yes — the CSF 8317 was specifically developed to handle the increased heat output of heavily modified S63 engines, including those with upgraded turbos and the CarBahn S63 Stroker Kit. It fits the F9X M5 platform and is engineered for exactly these high-demand applications.

Q: Why should I upgrade from the OEM oil cooler if mine hasn't failed yet?
A: The OEM cooler's tube-and-fin core and brazed end tank construction have known durability weaknesses, particularly given the unit's vulnerable low-mounted position. Owners of lowered S63 cars are at elevated risk of oil cooler damage from front-end scrapes or bottoming out. Beyond durability, the factory unit's cooling capacity can be overwhelmed on tuned cars — with some owners reporting oil temps exceeding 240°F (115°C) on track days. The CSF 8317's 33% larger core and bar-and-plate construction address both concerns proactively.

Q: Does this cooler come with a warranty?
A: Yes. The CSF 8317 is backed by a 2-year limited warranty, and every unit is individually leak and pressure tested before shipment.