When I searched online 5W was all that came up. Keep us posted on how you go. Changing oil in these things shouldn't be rocket science, so long and you keep note of how the shims etc are placed. I know a few people that have done it themselves.
Alan ,
Will do . Will do fronts first this week . Pulled them today still seem good adjust very quick from full loose to where i cant pull them at #4 from loose . This goes back to how car towed on trailer last week will not tow full loose . Plymouth was floating like shipp in heavy sea .
These shocks must havev70000klm at least on them
Got to finish Riley powered Austin Healey exhaust first . Now this is a daft manifold set up .
Tex