"Adrian" wrote in message
...
On Sun, 07 Jun 2015 18:53:33 +0100, Jim at the Common Riding wrote:

what about gaskets and rubber seals etc... will heavier mineral oil
bugger them up ? .....

Nope. But the thicker viscosity will give higher pressures which
_might_... Very unlikely, though.

OK thanks...I'm going to use the 10w 40 mineral up then ......