Hobao H4e Diff oil for polished wooden floor

[rhbmcse]

Hi again folks.
No doubt a few of you will have been reading my threads with interest.
I'm building a h4e now to replace my TT02's.
First time I've built a touring car with a proper diff!

Havent looked at the destructions yet but I'm assuming it's a gear diff.

Guessing for a polished wooden floor I need very thin oil.

What does everyone recommend?

Also, I know this car doesnt have a front diff, but what exactly is a spool???

One of the other guys at our club running this put a diff in the front too as he said it was a pain to drive on a slippery floor but Im going to give it a go anyway!

Thanks guys.

Rob.