Kuhn power harrow gearbox oil

[jd6420s]

I am changing the gearbox oil in my Kuhn power harrow. The manual says that it should be refilled with Shell Spirax 90 EP oil. They don't make this anymore. What oil should I get instead?

 

[Timbo]

A good quality GL4/ GL5 EP80w-90 or 85w140 be what you want.