Manitou specifies 5W-40 multiviscosity fork oil for their shocks and they seem to be the only manufacturer specifying 5W-40. I can find plenty of bicycle fork oil, but just about all are single viscosity, like 5, 10, 20 weight. Motorex does offer a 5W-40 fork oil, but it's not readily available.
1. is 5W-40 fork oil the same as 5W-40 engine oil?
2. any known and available "bicycle fork oils" compatible with Manitou forks?
3. I'm hoping the LMS (local motorcycle shop) has 5W-40 fork oil, but if not, any recommended viscocity?