Hi Vij, the haynes book says " Hi melting point Lithium based grease '
Castrol LM Grease.
I just use a common 'Multi Purpose LM grease' from my local car parts shop.
I agree with Ian Vij, I also use Castrol LM grease. I bought myself a large lever-action grease gun, to give me plenty of 'grunt' when re-greasing the front king-pins.