If you want a gear oil that surpasses most other good fully synthetic gear oils, then use QMI 75W90 fully synthetic gear oil w / SX6000. Used for gear, universal joint, transfer case, differential etc. Has GL5 specifications. Available in 1.6 liter, 5 liter and 20 liter containers. Price including VAT, from NOK 250 to 195 for the liter.