FORTEC Full Synthetic Gearbox Oil Spec R SAE 75W-90 GL-5 (2 x 1L Bottles) for Mazda RX-8 (Series 1 & 2, 2003-2012)

FORTEC’s Spec R 75W-90 GL-5 is a premium full synthetic racing gear oil developed for high-load motorsport and fast-road use. For the Mazda RX-8, this grade is the better fit for the manual gearbox, offering smooth shift feel from cold to hot while maintaining a stable oil film under sustained heat and load.

• Full synthetic 75W-90 GL-5 racing gear oil in 2 x 1-litre bottle
• Developed for high-load transmission and LSD-compatible applications
• Helps maintain smooth shifting feel from cold start through to hard driving
• Designed to provide strong oil film strength and gear protection under heat and load
• Well suited to RX-8 owners wanting a premium gearbox oil for spirited street or track use

You will notice a more consistent and confidence-inspiring shift feel, especially once the car is driven hard and temperatures rise.

For a more complete driveline service, consider pairing this with the FORTEC 80W-140 Racing Gear Oil for the differential and the R-MAGIC 6-Speed NC Nylon Shift Collar for a sharper shifting feel.