[royce]

the clear stuff similar to air hose for fish tanks is pvc too, doesnt mean its ok for fuel, pvc doesnt mean no good for oil as a blanket rule

I reckon if your diff is hitting 60 up there somethings wrong, or your baby girl hands cant handle a bit of warmth

As to its suitability, ive used it on every breather ive ever done, Bruces are a million years old with no sign of them failing (including the 1/4" ones on teh swivel hubs)