Thank you Jazz,

I did find a reference to Lithium based grease and oil in a PDF. The oil is stated between 30 and 150 cSt and 0.3 cm3 per hour!

I was just confused by the foam insert and couldn't find reference to it in any HiWin literature. Great to know there is nothing like that in the HiWin replacement carriage.

The machine is running a lot quieter on that axis and hopefully the surface finish will be far better in the Y travel.