Quote Originally Posted by m_c View Post
...10W40 oil acts like a SAE10 oil at 25degC, and a SAE40 oil at 65degC...
How hot should the headstock get - not 65°C? At the moment it's a little warm, but not excessively.

Quote Originally Posted by m_c View Post
Engine oils also have a lot more additives and detergents (with the exception of the more specialist SAE oils aimed at small engines/classic engines), which there is a possibility may cause issues with some seal types, and the detergents can dislodge drit/grime that would otherwise be sitting causing no problems.
I've searched on other forums and it looks like other people have used it. Some of the additives might be beneficial...

I'll get the hydraulic oils for £13.71 off eBay to be safe. It doesn't say in the manual how much is required, but I should think 5L of each is plenty.