The HKS Differential Oil Cooler Kit is designed to control differential oil temperatures on the Nissan GT-R R35 during high-load driving. On track, the R35’s differential oil temperature rises quickly, which can reduce lubricant performance and affect LSD operation. This kit stabilises oil temperature and reduces heat-related degradation. Product Overview This kit uses a dedicated oil cooler core, an HKS electric oil pump, and a CFRP air duct to direct airflow efficiently. The core is mounted inside the rear undertray where it can receive clean airflow without affecting the vehicle’s exterior appearance or exhaust routing. Features Oil cooler core size: 200 × 132 × 48 mm (cooling fin) Core designed specifically for the R35 GT-R CFRP air duct matches the factory rear under cover Highly durable AQP Racing hoses for oil lines HKS electric oil pump included for consistent flow Relay box, wiring harness, and ON/OFF switch included Designed to avoid interference with factory exhaust systems Cooling Performance In-house HKS testing at Fuji Speedway showed the following reductions: Differential oil temperature: approx. −37°C DCT oil temperature: approx. −5°C Coolant temperature: approx. −3°C Results may vary depending on vehicle setup and driving conditions. Included in the Kit Oil cooler core CFRP air duct HKS oil pump AQP Racing oil hoses Relay box and wiring harness ON/OFF pump switch Mounting hardware Notes This product has been discontinued by HKS but remains an excellent reference for vehicles requiring diff cooling. Performance data is based on HKS in-house testing. Installation Manual Download HKS Install Manual (27002-AN003)
